in key states. also a virginia police officer gunned down on her first day on the job. an army sergeant also accused of killing his wife. the flint michigan water crisis, newly released e-mails reveal office. and the gymnast who is blowing routine. >> this is a very traditional sport, and what you did is very non-traditional. >> not traditional at all. this is the "cbs overnight news." welcome to the overnight news. on march 1st, some candidates might get their last chance. super tuesday brings primaries and caucuses in 12 states. for rmepublicans, about half of the delegates needed.

third. a new poll shows donald trump leading in states except for texas where cruz leads. we have both races covered beginning with a new controversy surrounding trump today. here's major garrett. >> i don't know anything about david duke, okay? i don't know anything about what you're even talking about with white supremacy or white supremacists. >> reporter: donald trump demured when he would condemn supportive comes from david duke. >> i don't know what group you're talking about. you wouldn't want me to condemn a group i know nothing about. >> reporter: but trump's remarks today are 180 degrees from his stance friday when he was asked about david duke's endorsement. >> i didn't even know he endorsed me. i des avow. >> reporter: campaigning in massachusetts, john kasich says

>> donald trump refused to disassociate himself and condemn white supremacists. we don't have any room for white supremacists in the united states of america. >> reporter: ted cruz took to twitter. in virginia, marco rubio called trum's position unbelievable. >> we cannot be a party that nominates someone who refuses to condemn white supremacists and the cueku klux klan. >> the republican party is not treating me right, and they're not treating the people that i represent right. >> reporter: and there's some evidence to support trump's claim. a new battleground poll found that more than half of republicans in three super tuesday states, georgia, texas, and virginia, say the republican party does not represent them well.

those states think trump offers the most optimistic message. trump picked up the endorsement of jeff sessions. much. hillary clinton expanded her lead over bernie sanders with a prime airrirairary victory. >> tuesday primary, thank you. >> reporter: hillary clinton stormed into arkansas and tennessee on sunday, setting her sights on the handful of southern states that vote on super tuesday and trying to capitalize on her momentum with black voters who propelled her landslide victory in south carolina. nearly 90% of african-american voters backed clinton yesterday, breaking the record set by then senator obama in 2008, that spells trouble for bernie sanders, who had hoped to stall clinton's momentum heading into states where the democratic primary electorate is more

>> we did really, really badly with older african-american voters. i mean, we got decimated. >> reporter: the vermont senator has racked up delegates in iowa, new hampshire and nevada mainly with white, younger voters, but as he goes south, he is visiting states where the demographics play to his favor, like in oklahoma where he campaigned today. >> now i'm going to need your help here in oklahoma on tuesday. i'm going to need your help to win the democratic nomination. [cheers and applause] and i'm going to need, i'm going to need your help to win the general election. clinton meanwhile, is turning her focus away from sanders and pivoting to her next target, republican frontrunner donald trump, even if like earlier today in a memphis

never stopped get behind one candidate. voters don't seem to be listening to that message. >> when voters hear establishment, they view that as a bad word. they are less likely to any candidate who is too tied to the establishment. >> but they're not just siding with trump because they think he's anti-establishment, they also think he can win in november. >> they also think he's in the best position to win in november.

be right back. [ vocalizing ] [ buzzing ] [ tree crashes ]

the young police officer is being remembered tonight.

during her first day on the job. following an awful series of events in northern virginia. >> reporter: prince william county police department posted this picture of rookie officer ashley gwendon, about to start her first shift. the caption -- be safe. >> she was literally sworn in the day before, on friday. >> she interned for the police department. >> she clearly had a passion to serve others in a way that went beyond herself. >> reporter: she and two other officers responded to a domestic disturbance on saturday. when they arrived, suspect ronald hamilton opened fire from the front door. >> we have three officers that have been shot. >> reporter: guher training officer along with jessie hempen

>> officers provided first aid to the wounded officers, and as rescue staff could get on scene later in the afternoon, officer guindon succumbed to her injuries. hamilton is an active duty staff sergeant who works at the pentagon. no one knows which he fired on the officers. neighbor leon harris described him as a gentle giant. >> the guy was a great guy. great neighbors, just something must have snapped. >> reporter: early sunday morning, more than 100 patrol cars lined up outside the hospital where the officers what taken. they provided escort to a young woman whose first day on the job tragically became her last. hamilton is expected to be in court tomorrow. he faces one count of capital

is held without bound. and the state's attorney will seek the death penalty. anger over a police shooting sparked dangerous protests that shut part of downtown salt lake city. >> reporter: violence exploded late saturday night after a salt lake city police officer shot a 17-year-old black teenager in the chest and stomach. his friend saw the shooting. >> when the cops came, they ran up and told him to stop. and when he was turning around, they shot him. i know he got, i seen his chest and his stomach. >> reporter: police responded to a call to break up a fight outside this homeless shelter. police say they opened fire after mohammed refused to drop the weapon. kutvs jeremy harris was one of the first reporters on the scene. >> the witnesses were very worked up. very angry. you could tell there was a lot

so many people saw this. at any given time there were 50 or more people standing outside the homeless shelter. >> reporter: protesters launched bottles and rocks at police. >> the witnesses say this was about race. in fact, several people were walking by, chanting "black lives matter." >> reporter: also the officers wear body cameras and will release the video of the shooting as soon as possible. meanwhile, mohammed is in critical condition. and two officers are on routine paid administrative leave. in hestonshesston, kansas, we have a survive story. >> reporter: adam miller came face-to-face with the shooter. >> i saw him come around the corner, and he just looked kind of confused. so i told him he needs to run, there's a fire.

so i told him again, and he said i know, and then he shot me. >> reporter: cedrick ford shot 17 people, including 14 co-workers, quilling three of them before police shot and killed him. investigators believe he acted out in violence after being served with a protective order taken out by an ex-girlfriend. across hesston today, it was a time to come together. at sunday's services to honor the victims, and at a town hall meeting where sergeant chris carter, one of the first on the scene was embraced by the community. >> the people that worked at that place were phenomenal. their actions were heroic that day. >> reporter: hesston strong has become a motto here. >> they're all going through a really tough time. the least i could do is come out and help. >> reporter: for many, healing means forgiveness and compassion, even for the killer. >> i don't know what he was going through, but obviously, he

so my heart just aches for him. >> reporter: there will be a memorial service tonight at hesston high school. next week, ford's ex-girlfriend is expected to face a judge for giving him weapons knowing he was a convicted felon. syria remains relatively calm, two days into a he cease-fire, but the quiet has brought little comfort. >> reporter: three years a the city of homs was the fiercest front line of the war. then they moved on, leaving a wasteland and hundreds of thousands of homeless people. in some parts, residents are trickling back, reestablishing the essentials of life, commerce, even school. this is day two of the partial cease-fire, and people are holding their breath, hoping it will hold. right on the edge of town, we

but with no monitors anywhere, it's impossible to say who is attacking whom. the numerous reports of violations today underline what a fragile thing the partial truce is. but 48 hours in, everybody agrees, things are much quieter than they've been in years. though the kind of lasting peace to rebuild in a place like this still feels a long way off. elizabeth palmer, cbs new, homs. in iraq, dozens were killed and about a hundred hurt. a group affiliated with isis claimed responsibility. a series of gas explosions in a russian coal mine have killed at least three dozen. it happened in northern russia, above the arctic circle. 81 minors were rescued after the original blast, but those still

coming up, we follow the new e-mail trail in a flint water crisis. and a cruise ship threatened with a sequel. cbs news will be right back. did you know there's a cough liquid that lasts for twelve hours? try delsym twelve hour cough liquid. its advanced formula releases powerful medicine that acts fast

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are you taking a zumba class? sometimes we use k-y ultragel to enhance my body's natural moisture so i can get into it a bit quicker. and when i know she's into it, i get into it and...

thousands of e-mail released this weekend show how the michigan governor's office struggled to handle a water crisis in flint. we've been reporting on this story for months. we have this update. >> reporter: just weeks before governor rick snyder declared flint's corrosive river water unsafe to drink, there was a push to discourage a push back to the old water-source. the governor's aide was told, gentlemen, in the attached is a description of what it would cost to reconnect to detroit water. the estimated cost was $12 million a year. the city eventually did rekent to detroit water in october of 2015, days after the governor declared flint's river water unsafe. the announcement was triggered

linked lead poisoning in children to the river water. one thing we keep hearing is that the governor is not involved or is detached. this would be good to show that he's there and he cares. and if we don't announce until he's there, we can avoid the protests and still get the optics. the protests have continued. the fallout was eerily predicted in an e-mail sent more than a year ago when the governor's special prongs projects manager wrote, this is a public reasons nationally, friday the government admitted he should have been more directly involved back when his aides first e-mailed about the problem. >> that's where i'm kicking myself every day. i wish i would have asked more questions. answers. i'm not going to have that happen again. >> reporter: snyder says he's working to expand health care

subsidize their water bills.

five-hour tantrum. this time it seems better safe than sorry. the ship was damaged by 30 foot waves and hurricane-force winds earlier this month. it is one year old and based off new jersey. a frightening scene at a hindu festival in india. an elephant went on this rampage. started picking up truck and

no one was hurt, including the back. some winners on the baseball field will no longer get their just desserts. the baltimore orioles have banned the tradition of smashing wins. they say it's about safety and the pie smashing can be too dangerous.

has the internet flipping out. finally, tonight, talk about gymnastics floor routines and many picture something like ballet set to classical music.

gymnast stretching the limit to a different beat. >> reporter: gymnastics is all about grace. >> nice. >> reporter: power. and hip-hop? it's not just the high notes that ucla gymnast sophiena hits, it's those moves. this is a very true diggsal sport, and what you did was very non-traditional. she and her teammates are changing this. >> i feel that it's much more about entertainment now than the ridge id sport as perfection. >> reporter: she is getting high marks from judges. but even higher marks on social media, where her floor exercise earlier this month, the first time she ever performed it, went viral. >> i woke up, and my mom called,

have like 5 million views on your floor routine? i didn't know it was posted anywhere. >> reporter: it's now been times. tell me some of your responses. >> some of my favorite ones have been marriage proposals and prom proposals. >> reporter: and a lot of celebrities have taken notice. >> yes, reese witherspoon. i found out that chris brown posted it on his facebook. i was like oh, my gosh. no way. >> reporter: even her teammates have gotten into the groove, along with her coach, who admits you can please a crowd but still not please everyone. >> i think there are judges that still don't like it. picasso. there a lot of people who would not put a picasso in their home because they don't like it. but that doesn't mean it's not excellent art.

has danced professionally. ly not find the nae nae, the whip and the dab in reno. >> the one performance i did, that was my olympics. >> reporter: and a moment as good as gold. carter evans. cbs news, los angeles. that is the overnight news for this monday. for some of you, the news continues. for others, check back later for the morning news and cbs this morning. this is the "cbs overnight news." welcome to the overnight

the biggest day in presidential races comes tuesday. clinton came away with 72% of sanders sanders. trump has the support of 40% of primary voters, compared to 27% for marco rubio and 22% for ted cruz. trump is also at 40% in georgia. but in his home state of texas, cruz is out front with 42%. 11 points better than trump. marco rubio's in third. cruz discussed the race on "face the nation." >> i think super tuesday is the most important day of this primary election. it is the most delegates awarded in a single night will be

think we are positioned to have a very good night on super tuesday. about 65% of republicans believe that donald trump is not the best candidate to go head to head with hillary clinton, and we are the only campaign that has beaten donald trump, and we're the only candidate that can beat donald trump. if you look at the super tuesday states, we are running neck in neck with donald all across states in super tuesday. it's important that they recognize that nominating a candidate who agrees with hillary clinton, who has a very similar record, is not the path to victory. if conservatives stand together, we're going to have a great night on tuesday. >> reporter: if you don't, is he unstoppable? >> there is no doubt, that if he wins everywhere with big margins, then he may well be unstoppable. but if you are at home and you don't want donald trump to be the nominee, then the only

our campaign, and so i would encourage you, even if you like another candidate, stand with us, if you don't want donald to be the nominee, because if and when we stop him on super tuesday, that's how we end up beating donald and nominating a proven conservative, which is what it's going to take to beat hillary. >> reporter: what did you make of chris christie endorseing donald trump? surprise. rubio campaign. but at the end of the day, the washington establishment is going to go where they're going to go. this super tuesday is a battle to determine where conservatives go. and i think the debate this week was really some powerful moments of clarity. we saw that donald trump has the same issues on issue after issue as hillary clinton. he agreed with hillary clinton on libya, toppling the government in libya. that led directly to benghazi, led to handing that country over to radical islamism. he agreed with hillary clinton

with hillary clinton on being quote, neutral on israel and the palestinians. as president, i'm not going to be neutral. america will stand unapologetically with israel. then he agreed with barack obama and hillary clinton on the tarp bailout of big banks. i think the government ought to be standing with main street, working men and women, then you put on top of that the ethical issues, whether it is refusing to release his taxes, and that's a real problem. >> reporter: why is that a problem? >> he said in the debate, he said gosh, i'm being audited for two years, then he said three years, then he said maybe five years. listen, if there's a problem in his taxes, the voters have a right to know. because come september, october, the general election, folks in the media are going to make a heyday about any problems in his taxes, and voters have a right to know. and the excuse that he's being

important for him to release his taxes so the voters can see, mitt romney suggested there could be a bombshell there. i don't know if there is or not, but donald is hiding them from the voters and he owes candor to the voters. >> reporter: speaking about candor, he's said some bracing things about you. >> donald is a charming person. i mean, he can be fun. >> reporter: he didn't say charming things about you. >> he can turn on you. overnight he can turn on you and get nasty and personal and virks. listen, i treat him as an entertainer. i laugh him off. it's like going to the circus and seeing the acrobats and dancing bears. he's willing to say things that are patently false. so, for example at the debate this week, he backed off of his health care position for 20 years. for 20 years he has agreed with hillary clinton and bernie sanders on socialized medicine saying obamacare doesn't go far enough.

for everyone's health care and control it, is it true or false the government saidhould pay for everyone's health care. we had video of him a few months ago saying exact lit opposite. and what i think the debate this week did is gave real clarity to the voters, that to beat hillary, we need a consistent conservative, someone who has stood for free market principles, who has stood for the constitution, and critically, who's stood for the country. you know, you look at, we talked a lot about donald's record on immigration. there's iranony that he made the center of his campaign on immigration. he faced a judgment for a aliens. just this week, news broke that he has hired foreign workers at

he did an interview where he said you can't find americans to do these jobs, to be waiters or waitresses or bellhops. what ridiculous nonsense. the new york times reported roughly 300 americans applied for those jobs. he only hired 17. instead he brought in foreign workers. and i think the american men and women are getting hammered right now. they want someone they can trust to stand with them. and part of the reason so many conservatives are uniting behind our campaign is i'm the only one who lid the battle against amnesty, led the battle to secure the borders, led the battle for the working men and women. >> let me ask you about your position with immigration, bill o'reilly presented you with a hypothetical about somebody who overstayed their visa and he said president cruz is going to send the feds to his house, take him out and put him on a plane, and you said you better believe it.

tapper you said we don't have a system that knocks on doors in every case in america. in one case you're knocking on doors and the other you aren't. >> we don't have storm troopers to knock on the doors of every american citizen. but when we have evidence that a particular person has committed a crime, we send law enforcement to apprehend them. and the specific question was visa overstay. right now current law requires a biometric entry system when you come in on a visa. and the obama administration is ignoring federal law. 40% of illegal immigration is not people who cross the borders illegally, it's people who come on a visa and never leave. the "cbs overnight news" will be right back. sweaters stretch into muumuus. and pilled cardigans become pets. but it's not you, it's the laundry. protect your clothes from stretching, fading, and fuzz. ...with downy fabric conditioner...

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him a con man. john deckerson spoke with both rubio and trump for "face the nation". >> i'd like to ask you about a washington post headline that says rubio's strategy for super tuesday is survival. do you agree with that characterization characterization? >> no, i don't. we're not the front runner, brother' an underdog. and i relish that. i've been an underdog in personal life and in politics. they're awarded proportionally. and we're going to move on. here's what's never going to happen in this race. there's never going to be a time when the republican party rallies around and says you have to get out for purposes of rallying around donald trump. he's not a republican, he's not a conservative. he's trying to pull off the biggest scam in american political history, a conjob where he's trying to take over the republican party by telling people he's somebody he's not. we're going to be in this race

states to ensure that i'm the nominee and that donald trump never gets the 1,236 delegates which is what he needs to be the nominee. >> your campaign's got and lot scrappier. is it too little too late? >> i don't think so. for a couple reasons. one, i never wanted it to get to this point. i hoped by its own course, by the way media covers politics, people would open this eyeeir eyes and see who he really is. but he's been able to fool a significant number of people into believing that he is something that he's not. he is a world class con artists. he conned all these people who signed up for trump university. now he's trying to persuade us that he's fighting for american workers, but he's hiring foreign workers for his hotels, that he's going to bring back jobs from mexico and china, but he's

mexico, because that's where all the suits and ties that he sells are made. it's a scam. and we're going to unveil it and reveal it and the more people learn about that, the less support he's going to come. >> you said he's running a big scam, it's a con job. how can you retain the position that if he's the nominee you'll support him? >> because he's never going to be the nominee. so i'm not worried about a hypothetical that's never going to happen. >> well, i think you understand exactly what's going on. you pick up any paper, and it's always talking about how are we going to overthrow donald trump? i'm representing millions of people that really feel angry an disen franchised. and these are great people. i love them. and we're not being treated right. the republican party is not treating me right. and they're not treating the people that i represent right. >> let me ask you a question

what about releasing a summary? that's sometimes what candidates will do, show your income, charitable deductions, tax rate, would you do that? >> i've already released my financials, which are massive, and by the way, we've shown a tremendous company, it's over $10 billion in net worth that i built with a very, very small starter loan years ago. and i've already done that, and that's down and filed in the federal elections office, and if people want to see it, they can go see it. and obviously, all of your coe mores have gone through them in great detail and i've been given great reviews for what i've done. you don't learn very much from tax -- hey, john, you don't learn very much from tax returns, let me tell you right now. but when you're under audit, you don't give your papers. i've been under audit for so many years. every year i get audited for maybe ten years, 12 years. i think i'm being singled out.

but the irs audits me every year. i have friends who are very wealthy, i say, do you get audited? they don't know what i'm talking about. >> it's been raised about foreign workers in florida. the "new york times" said there were people who wanted the job. and you said you could only find foreign workers because there weren't americans who wanted the job. but the new york times said there were people who applied. >> they have to be qualified. it's very, very hard to hire people, qualified people. and a lot of people don't want the job because it's a three or four month job. it's very hard to get people. it's just one of those things. everybody is working. then during the off-season, it's easy, but we don't have the people during the off seenason, because the club closes. a lot of people don't want a part-time job. >> you say people should come

products here, have american workers, but why wouldn't those companies say a version of what you're saying, if they can't find the workers here and they have to go other places, why wouldn't they do what you're saying? >> they're full-time jobs. a lot of the people that we've made offers to and where we make offers, when they hear it's a part-time job or a four month or five-month job, i understand they're not interested. but what you don't talk about is the thousands of people that i do hire. i have thousands and thousands of people on my payroll, over the years i've had tens of thousands of people that work for me. you're picking up one club where it has a high season where it's very, very hard, it's very hard to get people in palm beach during the season, during the social season. >> michael hayden is the director of national security agency said if you ordered u.s. forces to kill the families of terrorists, which you've suggested and to use water boarding as you've also suggested that they would refuse you.

>> i don't know what he means by refuse. i can only tell you, there's a lot of bad things going on. they're chopping off head the in syria and all over the middle east. isis is doing a number of, plenty of others beyond isis is doing it now. all i know is when they start chopping off heads we have to be very frm. we have to be very strong. we have to be very vinl length. and i heard the statement and disagree. we have to be very strong. can you imagine these people that chop off heads of christians and plenty of other people and do it routinely and drown people in big steel metal cages, they leave it in for a half hour and pull it up and everybody's dead. when they hear us talking about

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let's end this. bernie sanders insists hislop sided loss to hillary clinton in saturday's south carolina primary will not be repeated in the super tuesday states. he got only 26% of the vote to clinton's 73%. in virginia, it shows sanders trailing clinton. sanders discussed the race with john dickerson for "face the nation". >> it was a disappointing loss in south carolina last night.

when analysts look at that map, they say there as not a plausle path for you to the nomination, what is your response? >> my response is we're in minnesota. i think we're going to win in minnesota, colorado, and massachusetts and vermont, and i think we've got a number states coming up that we're going to do extremely well and possibly win, including california and new york state. so i think we do have a path to victory. now i won't tell you that we didn't get beaten and beaten very badly yesterday in south carolina. i congratulate secretary clinton on her victory, but john, i think for us, that is about as bad as it's going to get. >> when you look at the progress you've made, which surpasses all analysts who would have looked at your campaign from the beginning, even given the progress you've made, is there enough time left? you've mentioned some places where you think you've done well, but isn't time kind of running out? >> well, no.

i think you've got, on tuesday, we're going to have over 800 delegates being selected. i think we're going to went a very good share of those delegates. i think you have major states coming up. and i think the important point is that people throughout this country are resonating to our message, and the message is that super pacs and a corrupt campaign finance system, destroying american democracy, we're proud that we have received 4 million individual contributions, more than any candidate in american history at this point, and i think, john, people understand that the economy is rigged. they're working longer hours for low wages, almost all is going to the people on top. and even if south carolina, as badly as we did, and we did very badly, we won the votes of people 29 years of age or younger. the future of the democratic party, the future of this country, is involving young

getting them to stand up for their rights, dealing with student debt, which i got to tell you is just crushing people all over this country, making public colleges and universities tuition free, those are the ideas we are bringing out, demanding the wealthy and large corporations start paying their fair share of taxes. this is what younger people, working class people want. that is the future of the democratic party. >> but in order to create the kind of movement you've been suggesting and that you want, you're going to need to attract african-american voters, and your economic justice message just didn't seem to hit home in south carolina and in other places. isn't that kind of a fatal flaw? >> well, no question, i mean, let me be very clear. we did really, really badly with older african-american voters. i mean, we got decimated. on the other hand, if you look at the younger people,

and whites, we did much better. so, again, i think our message, the clinton campaign was very strong, remember, this is their fourth campaign in south carolina. two for bill clinton, two for hillary clinton. they had it well organized. they did well tonight, i congratulate them. we came into that state something like 7%, 8% in the polls. it was a tough row for us to hoe. but i want to thank all of our supporters, the members of the south carolina state legislature who stuck with us. but we are confident in the future. yeah. >> our polls show that one bright spot for you is that a big majority think you are more honest and trustworthy than hillary clinton. what does it say to you, though, that voters may believe that and yet are voting for hillary clinton? >> well, i think people cast their votes for a number of reasons. i think, if you look at your polls, you'll probably find that many, many people think that our

believe the future of america should be. our views are closer on economic issues. a lot of those polls come down to demographics, to age, to how much money you are making. look, the bottom line is, we started this campaign, john, 3% in the polls. in the last two weeks, that means in national polls actually had us in the lead or reasonably close to secretary clinton. if you were with me yesterday in texas, you would have seen 10,000 people in austin, 8,000 people out in dallas. we had a wonderful turnout in rochester, minnesota last night. i believe we have a lot of momentum. sometimes the media says this state out of elections, it is the end of the campaign.

we have dozens more states to most ducks fly south for the winter, but one very special duck just gets under the covers.

heartwarming story on the road. >> reporter: a lot of kids go to the park to see ducks. but kylie brown of freeport, maine takes her duck to see the park. snowflake comes here to swim around the pond and returns when called. because snowflake truly believes kylie is his mother, and the duck is not alone in this delusion. >> i'm his mom. >> reporter: are' not really his mom. >> yes, i'm his mom. >> reporter: how did you first find out? >> that he was a duck? >> reporter: no. kylie is unbearably cute. and since i never did recover to ask that question again, let he just tell you that kylie first noticed snowflake's attachment the day the browns brought her home last summer. >> look, look, look, he follows her. >> reporter: for whav reason, the duck imprinted on kylie and

matter what the hour. when snowflake refused to stay in the back yard, her parntss had no choice but to give him a diaper and make him a house duck. >> he goes everywhere the ducks are allowed and almost everywhere they're not allowed. i don't know if you have a 2-year-old or 4-year-old that won't leave home without her blankie? she will not leave home without her duck. at that point, nothing's negotiable. >> reporter: he goes to the beach in summer and sledding in winter. he's gone to soccer practice, gone on sleepovers and went tricker treating as olaf, the snowman from frozen, and over time, because they both sincerely believe they belong together, snowflake and kylie have formed a bond like most of us will never know. >> it's special even at 5 years old that i know that's the type of person she is going to be. >> reporter: she really is going to make a great mom some day, mostly because she already is.

up and go to college. >> what? >> reporter: steve hartman, often the road in freeport, maine. that is the overnight news for this monday. for others, clerk back with us a little later for the morning news and "cbs this morning." it is the biggest presidential primary day of all, with one full day left until super tuesday, a new cbs battleground tracker poll shows

ahead in two key states. >> you have one hit. also tonight, a virginia police officer gunned down on her first day on the job. under arrest, an army sergeant, also accused of killing his wife. the flint, michigan water crisis. newly released e-mails reveal failure and frustration in the governor's office. and the gymnast blowing up the internet and breaking the routine. this is a very traditional sport and what you did is non-traditional. >> not traditional at all. this is the cbs yoefr"cbs overnight news" news". welcome to the overnight news. on march 1st, some candidates might get their last chance. super tuesday brings caucus and primaries in 12 states. for republicans, about half the delegates needed for a presidential nomination are up for grabs. for democrats, it's about a third. a new poll shows donald trump comfortably ahead in the key