events. it's tuesday, march 15th, 2016. this is the "cbs morning news." critical contest. a day in the race for the white house. donald trump could put even more distance between himself and his republican rivals while bernie sanders looks to cut even deeper into hillary clinton's lead. an american in isis? kurdish forces say they captured a man from the washington, d.c., suburbs who was fighting for the terror group. a maryland police officer is killed by friendly fire in a shootout that was recorded by the alleged gunman's brothers. and just how smart is your phone? a new study finds you might not want to turn to those popular

an emergency. good morning from the studio 57 newsroom at cbs news headquarters in new york. good to be with you. i'm anne-marie green. we begin with politics and a day that could be pivotal for presidential hopefuls in both parties. five key states hold primaries today. for the republicans, winner-take-all contests in florida and ohio. may be the last chance to slow donald trump's march to the nomination. for the democrats, bernie sanders is hoping for another come-from-behind win in a big state to cast doubt on hillary clinton's candidacy. don champion is in miami. don, good morning. >> reporter: good morning, anne-marie. with donald trump still steaming ahead, political futures are on the line for republican hopefuls like marco rubio and john kasich today. both tried making last stands in their home states yesterday. meantime on the democratic side, hillary clinton is trying to avoid any surprise upsets today.

supporters late last night in chicago, urging them to take him to victory. >> let us see this great state help lead the country into a political revolution. >> reporter: hoping to slow hillary clinton's momentum, sanders is looking for upsets in illinois, ohio and missouri today. but the vermont senator faces an uphill battle in the delegate-rich states of florida and north carolina where clinton holds a sizeable lead. >> i am asking for your support. i would be honored to receive it. >> reporter: millions of votes have already been cast here in the winner-take-all state of florida where on the republican side, donald trump leads marco rubio 2-1 in polls. a trump win here will likely spell the end for rubio's campaign. >> we have to vote tomorrow. don't stay home. make sure no one stays home. >> reporter: and thrusts the billionaire candidate closer to locking up the republican nomination.

have a commanding lead in delegates and be in a commanding position to get the rest that he needs. >> kasich cannot make america great again. can't do it. >> reporter: in the winner-take-all state of ohio, trump is neck and neck with john kasich, the popular governor. >> give me a vote so i can continue to run for president of the united states. >> reporter: in missouri, ted cruz is fighting trump for delegates. and in illinois, the latest cbs news battleground tracker poll has cruz within striking distance. and just to show you how big today is, there are more delegates up for grabs today than almost any other day on the primary calendar. for some of the campaigns, it will be on to states like arizona and utah next week. anne-marie? >> don champion in miami, thank you, don. well, former republican vice presidential nominee sarah palin made a surprise appearance at a trump rally in tampa. she lashed out at the press for the way protests at trump rallies have been covered.

is all that petty punk-ass little thuggery stuff that's been going on with these quote, unquote, protesters. >> palin had originally canceled her appearance after her husband, todd, was involved in a snowmobile accident in alaska. he's in serious condition with a collapsed lung, eight broken ribs and other injuries. well, coming up on "cbs this morning," we will talk about the importance of today's primaries with cbs news political director and "face the nation" moderator john dickerson. an american who had been fighting with isis is in custody this morning after he surrendered in northern iraq. according to his driver's license, he's identified as mohamed amin of alexandria, virginia. he gave himself up to kurdish forces yesterday, and he said the situation with isis is not good. he was carrying a large amount of cash, three cell phones and

>> don't take a picture! don't take a picture! >> outside, an address listed on the driver's license of the captured isis fighter, two men shouted and pushed reporters. at one point turning a garden hose on cameramen. the men never confirmed that the isis fighter was related to them. the pentagon confirms, though, that an isis commander known as omar the chechen is dead. he's described as isis's secretary of defense. the u.s. government had a longstanding $5 million bounty on his head. he survived a u.s. airstrike in syria earlier in march but has since died of his wounds. and starting today, russia will begin withdrawing most of its forces from syria. president vladimir putin made the surprise announcement yesterday, ending a 5 1/2-month air campaign that bolstered the forces. putin and president obama talked by phone.

peace talks to end the civil war rheaumed in general neva. police in toronto are trying to determine if a stabbing at a military recruitment center might be terror related. a man walked into the center yesterday afternoon and attacked an armed forces member. others rushed to his aid, but a second military member was stabbed. the injuries are not live threatening. the suspect made statements that led police to look into a possible terror connection. three chicago police officers were wounded in a shootout with a drug suspect. the officers were investigating suspicious activity on the city's west side late yesterday. they approached a man and a woman who made a run for it. officers. their injuries are not life threatening. police shot and killed the suspect, and a woman was later captured. from the south to the midwest, folks are recovering from a rash and severe and in some cases deadly weather. yesterday a tornado touched down north of dayton, ohio.

several buildings were damaged. large hail and strong winds battered northern south carolina. wind gusts reached 70 miles per hour. and a state of disaster has been declared in nearly 20 texas counties hit by drenching rain and severe flooding. hundreds have been forced to evacuate. the investigation into an amtrak train that derailed in kansas is focusing on the condition of the rails. officials say the tracks had been inspected recently, but the engineer noticed something was wrong and slammed on the brakes. omar via franka reports. >> reporter: teams of investigators are now on the scene in southwestern kansas to try to determine what sent an amtrak train flying off the tracks overnight. >> need more personnel to respond to the train derailment three miles west of cimmaron. >> reporter: first responders raced to free passengers trapped inside when eight cars derailed. >> set a ladder up, and we'll start evacuating some of these people off the top.

vigilant and noticed there was something wrong, put the train into emergency braking early. that was probably responsible for the train derailment not being any worse than it was. >> reporter: the amtrak southwest chief carrying 131 passengers and 14 crew members was traveling from los angeles heading for chicago. 25-year-old daniel serva was reading on board. he said he felt some turbulence that, quote, turned drastic. >> i exited and as soon as i opened the room door, there was a large burning smell. got outside and there was a lot of people -- i heard people looking for folks. so everyone was just kind of on both sides of the train, kind of members. >> reporter: more than 30 people were taken to nearby hospitals. no word on how fast the train was going when it went off the tracks. omar villafranka, cbs news. coming up on the "morning news," a bizarre claim from the accused uber shooters. we will tell you what he's blaming for last month's deadly attacks.

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terrifying moments for firefighters battling flames at a maryland home. a wall fell on top of them. it happened early yesterday morning in germantown. eight firefighters were hurt, one seriously. the cause is undetermined. an uber driver blames an app for last month's kalamazoo shooting rampage, and the search for supreme court nominee is narrowed to three. those are some of the headlines on the "morning newsstand." "the new york times" reports three federal circuit court judges are on president obama's short list for the supreme court. speculation is focusing on shri

"the detroit free press" reports that the uber driver accused of killing six people blames the rampage on the ride-sharing app. jason dalton told police after the shootings in kalamazoo last month that his cell phone took over his mind. uber declined to comment. "usa today" reports that police gunfire killed an undercover officer during a shootout in maryland. colson arrived in an unmarked car during an ambush sunday at a landover police station. >> it was his actions that allowed officers to take a position where they could intervene and neutralize the threat. detective colson drew fire to himself. and in doing so was mortally wounded. >> police say the gunman charged in the ambush expected to die in the shootout. two of his brothers are charged for recording the attack on

"the hartford courant." he was expelled. his lawyer calls it excessive. the university says he had nonconsentual sex with a female student in 2014. he denies it. and "the washington post" reports an nfl official's admission is connected to brain disease. jeff miller acknowledged the link during a congressional hearing. it's the first such public admission by the league. still ahead, comedian jerry seinfeld drives off with a fortune. we will tell you what an auction of his classic car collection brought in. and you can thank drake later. the rapper's trash talking helped the raptors, but is it enough? this portion of the "cbs morning news" sponsored by seabond denture adhesive. no pasty ooze. just switch from denture paste to sea-bond denture adhesive seals. holds stronger than the leading paste all day...

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$750 million for its half of their joint music publishing venture. sony atv music publishing represents such artists as the beatles and bob dylan. jackson went into business with sony in 1995. jackson's heirs still own the rights to music he wrote. on the "cbs moneywatch," why your smartphone may fall short during a personal crisis, and jerry seinfeld sells his car collection. hanna daniels is at the new york stock exchange with that and more. good morning. >> reporter: good morning. a new study looks at how helpful your smartphone is in a health crisis. the answer, not very. researchers at the university of california-san francisco tested four popular voice assistants, asking them about rape, suicide and other health issues. answered -- answers varied widely but included "i'm here for you" and "i don't know what that means." several didn't recognize any concern when a user said "i'm having a heart attack." it was quite a day here on

federal reserve meeting. stocks finished mixed. the dow jones rose 15. the s&p finished 2 points lower, and the nasdaq gained 1 point. a remember toer volkswagen employee claims the german car company deleted documents and obstructed justice in the ongoing diesel emissions investigation. daniel donovan in a whistleblower lawsuit says volkswagen fired him after he refused to destroy evidence. voelgslkswagen says his claim is without merit. the lodging website airbnb plans to give neighbors of its properties represented a place to offer feedback. airbnb owners. the new feature will debut in weeks, first in japan. neighbors will be able to visit an online forum to comment and airbnb will take action when necessary. online retail giant amazon has filed a patent for its selfie pay. amazon shoppers would be able to

selfie photo instead of a password. in its patent filing, amazon says facial recognition technology is more secure than a password or a p.i.n. number. and there's a lot more room in jerry seinfeld's garage, but his wallet is pretty full, too. seinfeld auctioned 17 of his collectible cars for more than $22 million. he sold 15 porsches and two volkswagens. one, a 1955 porsche spider worth $5,335,000. when all was said and done, it appears the buyer got the bargain. the pre-auction estimates for all the cars listed was $10 million more than the final take. anne-marie. >> now i guess jerry can go shopping again. henna daniels at the new york stock exchange, thanks a lot. coming up, she's the mad mom who became an internet sensation. we'll hear from angry splash mountain lady about why she was really so mad. wait...

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you used to call me on my cell phone late night rapper drake gets the call he's looking for. the big toronto raptors fan distracted justin holiday long enough for the bulls' guard to get whistled for a five-second violation. drake's assistance wasn't enough to help the raptors. they fall to chicago 109-107. well, the march to the ncaa tournament is under way. vanderbilt's men's basketball team embarking on their trip to dayton, ohio, for their first-round matchup. the first two games are tonight. florida gulf coast takes on farleigh dickinson. that game is followed by

wichita state. and our coverage of the round of 64 starts on thursday. duke faces unc-wilmington at noon eastern right here on cbs. a scare in spring training for san francisco's newly signed ace, pitcher johnny cueto takes a line drive off the head after oakland. cueto stays in the game, but he was later taken to the hospital to get checked out for a concussion. and it turns out the woman known as the angry splash mountain lady really isn't all that angry. the unsmiling photo of her alone on the ride went viral. she did it to punk her husband who wouldn't ride with her. >> i kind of practiced it the whole way. and by the time we got to the last drop, i didn't know where the camera was. so i just guessed and looked over and it took the picture and that was that. >> the syracuse, new york, woman says that she's happy to be grumpy mom on the web along with grumpy cat.

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i'm all right oh, boy. >> i take so long. i take so long to set up my shots that my friends back home call me coma colbert. >> that's fantastic. >> "late show" host stephen colbert teeing off at the ed sullivan theater last night along with reigning masters champion jordan spieth. colbert's drive actually looks pretty good, but spieth's looked like it would have gone right down the fairway at augusta national. spieth is going to try to become the first repeat masters champ since tiger woods did it 14 years ago. our coverage of the masters starts saturday, april 9th, right here on cbs. a newly discovered tiny tyrannosaurus may have helped the t-rex evolve into a feared predator. brooks de la brag ga has

>> reporter: when it comes to dinosaurs, they don't get more fearsome. >> it's really deadly. >> i like its teeth. >> reporter: but how did the t-rex reach the top of the food chain? at the smithsonian museum of natural history, researchers found fossils belonging to a new species of dinosaur that could hold part of the answer. you might call him pre-rex. a horse-sized dinosaur that scientists say is a little predecessor of the tyrannosaurus tyrannosaurus. dr. hans seuss was on the dig in uzbekistan when the fossils were found more than a decade ago. >> yep. no, this was clearly a tyrannosaurus tooth. >> reporter: using ct scans, scientists determined that this smaller dinosaur already had the powerful senses of a predator. >> we were surprised to find out that like t-rex, it already had a very sophisticated brain, very keen sense of hearing, good low-frequency hearing will allow you to detect prey long before

>> reporter: discovering those abilities in a 90 million-year-old dinosaur helped scientists understand the evolutionary leap that made the t-rex possible. >> these predators became much smarter, much more advanced in terms of their sensory capacities before they attained the giant size that made them so famous in terms of the public. >> reporter: a famous dinosaur with a debt to his little cousin. cbs news new york. coming up after your local news on "cbs this morning," decision day as five states vote today. we'll speak with ohio governor john kasich. plus, spring break out of control. we will take you to south beach where police are battling crowds of partygoers. and actors eugene levy and catherine o'hara join us in the studio with their new series. finally, the smash musical hamilton rocked the white house yesterday. then its creator and star, lynn manuel miranda, was prompted

by the president. i'm anne-marie green. have a great day. freestylin' that you've never heard constitution potus i'm freestyling and you know this obamacare i'm looking up before you enacted that system the federalist papers

and sunny and bo it's 4:30, 45 degrees on this tuesday, march 15th. the rain has cleared up. the temperature, again, will be above normal again. good morning, everyone, i'm chris wragge. >> i'm mary calvi. we'll have traffic and weather on the 2s in a moment. first, a critical day in campaign 2016. five states go to the polls today and the results could make or make several campaigns. >> marcia kramer reports from florida, where marco rubio is desperate for a home state win. >> make sure no one stays home. we don't know how close this is going to be. >> reporter: marco rubio giving it his all, hoping to win his home state of florida. quite simply, if he can't win tomorrow, there will be intense pressure on him to drop out. it doesn't look good for the florida senator in a state where the winner takes all.