the results could send some packing. thurgent new warning about one of the biggest scams in america. fake phone calls demanding back taxes, threatening arrest. why you're more vulnerable now than ever. and tonight, the health alert for women. do not drink alcohol. now, the growing backlash and the apology. and the other big showdown. super bowl 50. the game plan, the security preps, and who's the new name added to the halftime show? and good evening from manchesterer. ank you for joining us on one of the most important nights of the presidential race so far. you can see this crowd right here gathering behind meme. tonight's republican debate could be a complete game-changer. the debate field now whittled down to seven candates. donald trump, back in the mix this time, after skipping that

the latest poll numbers just now coming , showing he is still the clear front-runner. marco rubio and ted cruz rigight there, tied for second place. and this, take a look, a live look at t debate hall right now. the energy building all across this state, but especially right here where the candidates will soon face each other and the nation. our team is covering it all and abc's tom llamas starts us off tonight. >> reporter: tonight, the stage is s. and candidates like senators ted cruz a and marcoubio getting a feel for the stage thacould change the direction of this race. rubio expected to take on the most fire tonight. his poll numbers rising, and so are the attacks against him. like from cruz, who is reminding voters who really won in iowa. >> what did you think about the really impressive third place finish of marco rubio? that's an odd collection of words, impressive, third place finish. >> reporter: rubio calling out cruz for his campaign's efforts

carson was dropping out of the race, which was not true. >> by the way, if you get a call on tuesday night saying that i dropped out, it isn't true, it's a lie. keep voting. >> rorter: and donald trump, leading in the polls here, but the race is tightening, starting the fight early, tweeting today, "wow, jeb bush, whose campaign is a a total daster, had to bring in mommy to take a slap at me. not nice."." >>ote for jeb. >> oh, yeah. >> reporte but that tweet's not stopping 90-year-old barbara bushsh. he doesn't give many answers toow he woululd solve oblems. heort of makes faces and says insulting things. >> reporter: jeb, bringing in his famous mother to help lift his campaign off life support. today, an encouraging sign. a crowd of more than 600. bush says he's his own man, but won't run from his famous last name. >> people are just going to have to get over it, all right? it's -- i am who i am, you know? it's --it's -- i'm in the establishment. >> reporter: bush, part of the pool of governors that includes chris christie and john kasich,

today, kasich getting a boost from another notable republican governor, arnold schwarzenegger, who compared him to that bullet-proof robot that made him famous. >> it absolutely would not stop. ever. never give up. so, this is you. you are the terminator. >> and tom, right here with me inside the debate hall. tom, you're hearing one of the biggest fights tonight might actually be a rematch? >> reporter: that's right, cecilia. get ready for jeb bush versus marco rubio part two. all week, bush has been hammering rubio, saying he has zero accomplishments. a top bush aide even calling rubio a no-show lobbiest. the rubio campaign says that bush is desperate, and they're going to be ready for anything tonight. i want to point out, cecilia, both o of those men will be standing right next to each other on that stage. >> anything could happen. tom llamas covering the republican race every step of the way. tom, thank you.

could shape the direction of this race, nearly half of all republican voters in new hampshire have yet to make up their minds. so, what are they waiting to hear? here's abc's jon karl. make the final push in >> show time is over. it's game time. >> reporter: -- the republican race is tightening. polls, but marco rubios rising. and cruz, kasich and bush are not far behind. it's just three days to go before the primary, and at the chez vachon diner in manchester, we found folks rdy to pick a president. well, almo. clearly you've made up your mind now, right? >> well, we haven't. >> reporter: you haven't made up your mind? >> we haven't made up our mind. >> reporter: he's not alone. amazingly, more than 40% of likely republican voters in new hampshire say they still havet made up their minds. he's narrowed it down to trump, rubio or cruz. >> i think we're stuck on -- will we tually have the nerve to vote for trump? i mean, that's really where we're stuck.

the, are you able to pull the lever for donald trump, is the question. >> yeah, that's it. i mean, a year ago, i couldn't imagine voting for trump. >> reporter: but there are two groups who seem totally decided. those who like the front-runner -- >> donald trump. >> reporter: n no matterhat? >> no matter what. i heard him. i likewhat he had toto say. i'm voting for him 100%. no changing my mind. >> reporter: and those whoho n't. >> i definitely know i would not vote for trump. that's all i really know. >> reporter: but new hampshire voters have a long history of making up their minds late and surprising everybody. after barack obama won the iowa caucusesight years ago, he was way ahead in the polls here in new hampshirire, but eed up losing to hillary clinton. this time, it's the republicans who seem most undecided. so, when will you make up your mind up, finally, totally make your mind up? >> i'd say really after this last debate. >> and so many people still waiting to make up their mind. jon joins me now inside the debate hall, too. jon, donald trump not at that

we know he will be here tonight. what are you hearing from the campaigns about his strategy? >> reporter: well, trump's xaun manager says if he is attacked tonight, he will respond in kind, times ten. but we really don't know which donald trump will show up tonight. weevil seen twon recent days. we've seen him go nuclear on his opponents, accused ted cruz of cheating in iowa. but we've seen him show incredible restraint. cecilia, we have never seen him debate after a loss. we justt don't know which one will show up. >> and we will seeee i soon. jon, thank you. abc political analyst matt could is dowd is here with me. who has the most to win here tonight who has theost to lose? >> well, it's pivotal for all seven up there tonight, but i would like to focus on three folks. john kasich has put all his chips on the table here. he's done 100 town halls and he has to figure out a way tonight to jump himself to second or third. the other person with the most to gain is jeb bush. he's spent more money than any other candidate in this race,

in the top four on tuesday, then his candidacy is on life support. and donald trump has the most to lose. he has been ahead and he is ahead by double-digits. he's led 70 straight polls since july here. and he cannot afford another second place finish, otherwise his campaign is seriously impaired. >> the whole team here covering it all. matt, you'd be backlater. thank you. the countdown i on for the democratic candidates, too. bernie sanders, the favorite son here.. hillary clintoton, the underdog. she was out going door to door herself today, while he was speakiking insid before a packed hall. abc's david wright is on the trail. >> it's a beautiful day in manchester! >> reporter: hillary clinton may be down in the polls here in new hampshire, but don't count her out yet. >> well, i need yourur help on tuesday, and convince some others to come along. >> reporter: today, she's been out popounding t pavement, knocking on doors, trying to make up ground against bernie sanders. >> i feel like a rock and roll

>> reporter: sanders has accused her of being wall reet's favorite democrat. not progressive enough. >> i have spent my entire adult life trying to knock down barriers. >> reporter: today, madeleine albright joined clinton, pealing to women, in particular. >> just remember, there's a special place in hell for women who don't help each other. >> reporter: but some of the people attending clinton's own event agree with sanders. >> probably for bernie sanders. >> i'm actually a bernie supporter. but you're here at a hillary >> i am. you are behind enemy lines? >> kind of. >> reporter: today at a town hall at new england college, the first questioner made a freudian clip. >> secretary sanders -- >> reporter: calling her by her clun linton took it in stride. >> there are a lot ofoung people that support my opponent. but i wantou to know, even if you don't support me, i support you. >> reporter: the sanders surge

clinton. but it will be interesting to see tonight on that debate stage how seriously the republicans take him. it's a pretty safe bet they'll mention her name more than his. cecilia? >> i think that's safe to say. david wright, thank you. and, of course, the debate, you do not want to miss it. just moments away. david muir and martha raddatz moderating at 8:00 p.m. eastern, right here. but we do now move on to other news. to tha deadly crane accident in new york. the move that went out of control, and the crane's sudden collapse, caught on camera. the cab of that crane landing upside down, its arm smashing onto cars below. one man killed, three others injured. abc's phillip mena w with the latest on the investigation tonight. >> reporter: tonht, a massive job. moving this collapsed crane, all 565 feet of it. crews forced to use blow torches to tear it apart, after it came crashing down friday morning in new york city. killing one and injuring three, crushing cars and sending this

you can see all that debris still on the road there. some of it came from the top of that damaged building, where part of the crane still lies. the unanswered question tonight, whatriggered the collapse? officials looking closely at the wind a snow conditions. how long do you think before we can figure out exactly what happened? >> you know, i think you're going to have to give us a couple of weeks at l least whi wewe do some engineering calculations, go throu the metal and how it failed. >> reporter: officials say the operator tested negative for drugs and alcohol, and has b been cooperating with the investigation. this crane is so big that workers are having to cut it into 35 pieces just to clear it fromhe street. cecilia? >> phillip, thank you. we turn now to a health alert. the cdc apologizing tonight after a controversial recommendation to women. it says women should refrain from drinking alcohol, saying the risk to babies is too high. the reaction, fierce.

here's abc's gloria riviera. >> reporter: women across the country, soundg off over the cdc's new alcohol anand pregnancy. >> ijust makes no sense to me. >> are you serious? is this really what you feel comfortable telling your wife, your sister, your daughter? >> reporter: while many women support the cdc's long-standing warning about the dangers of drinking while pregnant, the new guidelines hit a nerve, because they go further, telling health professionals to advise a woman to stop drinking if she is trying to get pregnant or not using birth control with sex. outrage exploding on social media. calling the advice patronizing and reactiona and sexist. the women we spoke to, telling us they can be trusted to make smart, safe choices. >> i really do feel they are overstepping their boundary in terms of what a woman can do with their own body. >> this is, perhaps, the right intention, with a very wrong execution.

u.s. are unplanned. many women don't know they are pregnant for several weeks. possibly unintentionally putting their child at risk. today, the cdc telling abc news, "we were sorry some people took offense at our communications." the cdc is standing by its advice, which, i it says, s only intended to clearly explain the risk drinking may have on an unborn child. cecilia? >> okay, g gloria, tnk you. and the debate stage set to take place right here in this hall, it's not the only showdown this weekend. the super bowl now less than 24 hours ay. more than 100 million people will be watching. the stage is set in san francisco. and abc's ryan smith h has the b ticket. >> reporter: super bowl frenzy in full effect. >> broncos! >> carolina! >> reporter: just 24 hours before super bowl 50, and fans are fired up. a clash of football's titans. all-time great peyton manning and the dazzling, dynamic

>> you don't go 17-1 as a starting quarterback without being awesome. >> peyton manning will always be an all-time great. even higher, bruno mars confirming he will be apart of the highly anticipated super bowl halftime show. joining coldplay and beyonce security, not taking a backseat. we're standing here in one of the security operations centers for the super bowl. can back each other up. and what are they looking for? well, they are looking on the streets, the staum itself, even the air space, to make sure at super bowl sunday is a safe one. safety is paramount. for players and fans alike, hoping the 5h super bowl is one r the ages. so, whwho will w the super b bowl here at levi's stadium? las vegas odds makers have the carolina panthers at 5.5-point favorites. and while most people we spoke to here have the broncos as the sentimental choice, they're picking the panthers to win it all. cecilia?

ryan, thank you. and still ahead on this special edition of "world news tonight," the threatening phone calls to watch out for. >> within the next hour, they will be at your doorstep to handcuff you and put you behind bars. >> a tax scam warning. why you may soon be more at risk than ever before. and later, the president of a fraternity at an ivyeague university under arrest. the allegations rocking that km pus.

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handcuff you and put you behind bars. >> reporter: the government is warning americans to be on high alert for a growing phone scam that is bilking americans out of millions of dollars. this chicago area woman got a call like that in december, from someone claiming to be from the irs, demanding she pay thousands of dollars in back taxes. >> andf we don't, there's a warrant out for our arrest. > reporte scared, she wired $10,000 to an account in seattle. it was all a scam. the irs says, since october 20135,000 victims, losing more than $26 million, to people pretending to be irs officials. so, how do you protect yourself? for years, the government has had this simple message. >> they often use a fake telephone number with a u.s. area code. they demand immediatete payment. they may threaten arrest or deportation. >> reporter: starting next month, a new law requires the irs to hire collection agencies to help collect taxes. and those agencies may call taxpayers. >> in e future, when

on behalf of the irs, people will be more likely to fall for that scam. >> reporter: paying taxes th don't owe. ron claiborne, abc news, new york. when we come back, held hohostageuring that bonnie and clyde crime spree. how the dangerous couple held one family for hours. what that family is saying tonight. and, fading out? why some of our favorite candies may soon look a little bit different. type 2 diabetes doesn't care who you are.man woman or where you're from. city country we're just everyday people fighting high blood sugar. i am everyday people. farxiga may help in that fight every day. along with diet and exercise, farxiga a helps lor blood sugarin adults with type 2 diabetes. one pill a day helps lower your a1c. and, although it's not a weight-loss or blood-pressure drug,

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attempted rape charges. 21-year-old wolfgang ballinger was arrested after turning himself in. the fraternity now placeon suspension. and to that bonnie and clyde crime spree. the frightening moment when this woman's husband spotted the dangerous couple right in their back p backyard. >> he saw a man standing thehere with a gun pointed at him, saying, open your door. and -- what do you do? >> the florida family he hostage for three hours. suspect blake fitzgerald was later killed in a police shootout. brittany harper is still in custody. a a can giant making some healthy changes. m&ms and skikittles argetting a makeover. candymaker mars is vowing to remove all artificial coloring from its products. the plan is to come up with healthier ingredients to create those vibrant colors over the next three years.

and still ahead on "world news tonight," it is almost time here. we are just waiting for the candidates to take the stage, so, what happens when they're all backstage? we go behind the scenes, when we come back. and finally tonight, it is me to reach my goals. so i liked when my doctor told me i may reach my blood sugar and a1c goals by activating what's within me. with once-weekly trulicity. trulicity is not insulin. it helps activate my body to do what it's supposed to do release its own insulin. trulicity responds when my blood sugar rises. i take it once a week, and it works 24/7. it comes in an easy-to-use pen and i may even lose a little weight. trulicity is a once-weekly injectable prescription medicine to improve blood sugar in adults with type 2 diabetes. it should be used along with diet and exercise. trulicity is not recommended as the first medicine to treat diabetes and shou not be used by people with severe stomach or intestinal problems, or people with type i diabetes or diabetic ketoacidosis.

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and click to activate your within. at ally bank, no branches equals great rates. it's a fact. kind of like grandkids equals free tech support. oh, look at you, so great to see you! none of this works. come on in. this is sheldon whose long day setting up the news starts with minor arthritis pain take tylenol or take aleve, the #1 recommended pain reliever by orthopedic doctors. just two aleve can keep pain away all day. back to the news. hi hey you look good. thank you, i feel good. it all starts with eating right. that's why i eat amaz!n prunes now.

i love these. sunsweet amaz!n prunes, the feel good fruit. it's a packed court right here behind me. it is almost time. we went behind the scenes today, right behind this stage. and it turns out, the tricky part is keeping all these candidates from psing each other in the hallway before they even step into this spotlight. the stage is set, the finishing touches complete. but you already knew all that. here's what you don't know. underneath those podiums -- we are in the athletic center of st. anselm. thcandidates won't cross paths until they're ready to take the stage. take a look at this. this is one of the candidates' dressing rooms.

here. just to burn off a little bit of steam before a debate, i don't know, maybe he wants to ride an exercise bike? long hallways. arrows telling the candididates where to go. this is a racketball court. candidates will be in there -- no, no candidates will be in there. here we go. the long walk to that stage. >> guys ready? >> and then, all those rivals standing there, waiting side by side until their name is called. >> donald trump. >> it's rehearsal time today. the fill-ins, students playing the role of a lifetime. as you can see, this is not the real jeb bush. i mean -- maybe. you have a good one-liner? >> i got the kneeldown, though. >> let's see. >> i got it down. i'm always staring at marco when he says something, too. >> you totally have it down. that's really good. let's see, best chris christie face? the whole gang is here. oh, hi david and martha. ready to go. and it all starts --

and -- go. >> the whole gang is, indeed, here. it does start right here in just a matter of moments. you can hear this hall buzzing behind me. the fireworks about to begin. i'm cecilia vega in new hampshire. thank you so much for watching.

here sn. james/wx wall a blizzard watch posted for north central iowa is in effect until noon monday. overnight tonight the clouds will decrease, the winds will become breezy at 10 to 15mph from the southwest, and the temperatures will stay mild, dropping only into the upper 20s. spoken like some getting used to...the season before spring! football sunday will come in like a lamb and roar out more like a

news at six... republicans