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 whos the new name added to the halftime show . And good evening from manchester. Thank you for joining us on one of the most important nights of the president ial race so far. You can see this crowd right here gathering behind me. Tonights Republican Debate could be a complete gamechanger. The debate field now whittled down to seven candidates. Donald trump, back in the mix this time, after skipping that iowa debate. The latest poll numbers just now coming in, showing he is still the clear frontrunner. Marco rubio and ted cruz right there, tied for second place. And this, take a look, a live look at the debate hall right now. The Energy Building all across here where the candidates will soon face each other and the nation. Our team is covering it all and abcs tom llamas starts us off tonight. Reporter tonight, the stage is set. And candidates like senators ted cruz and marco rubio getting a feel for the stage that could 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. Really impressive third place finish of marco rubio . Thats an odd collection of words, impressive, third place finish. Reporter rubio calling out cruz for his campaigns efforts on caucus day to suggest dr. Ben 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 isnt true, its a lie. Keep voting. Reporter and donald trump, leading in the polls here, but the race is tightening, starting is a total disaster, had to bring in mommy to take a slap at me. Not nice. Vote for jeb. Oh, yeah. Reporter but that tweets not stopping 90yearold barbara bush. He doesnt give many answers to how he would solve problems. He sort 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 hes his own man, but wont run from his famous last name. People are just going to have to get over it, all right . Its i am who i am, you know . Its its im in the establishment. Reporter bush, part of the pool of governors that includes Chris Christie and john kasich, hoping for a miracle in New Hampshire. Today, kasich getting a boost from another notable republican governor, arnold schwarzenegger, who compared him to that bulletproof robot that made him famous. Ever. Never give up. So, this is you. You are the terminator. And tom, right here with me inside the debate hall. Tom, youre hearing one of the biggest fights tonight might actually be a rematch . Reporter thats 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 noshow lobbiest. The Rubio Campaign says that bush is desperate, and theyre going to be ready for anything tonight. I want to point out, cecilia, both 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. One reason tonights debate 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 . Heres abcs jon karl. Reporter as the candidates make the final push in its game time. Reporter the republican race is tightening. Donald trump still leads all the polls, but marco rubio is rising. And cruz, kasich and bush are not far behind. Its just three days to go before the primary, and at the chez vachon diner in manchester, we found folks ready to pick a president. Well, almost. Clearly youve made up your mind now, right . Well, we havent. Reporter you havent made up your mind . We havent made up our mind. Reporter hes not alone. Amazingly, more than 40 of likely Republican Voters in New Hampshire say they still havent made up their minds. Hes narrowed it down to trump, rubio or cruz. I think were stuck on will we actually have the nerve to vote for trump . I mean, thats really where were stuck. Reporter so, when you go in there, are you able to pull the lever for donald trump, is the question. Yeah, thats it. I mean, a year ago, i couldnt reporter but there are two decided. Frontrunner reporter no matter what . I heard him. I liked what he had to say. Im voting for him 100 . No changing my mind. Reporter and those who dont. I definitely know i would not vote for trump. Thats 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 Caucuses eight years ago, he was way ahead in the polls here in New Hampshire, but ended up losing to Hillary Clinton. This time, its the republicans who seem most undecided. So, when will you make up your mind up, finally, totally make your mind up . Id 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 last debate. We know he will be here tonight. What are you hearing from the campaigns about his strategy . Reporter well, trumps xaun manager says if he is attacked tonight, he will respond in kind, times ten. Donald trump will show up tonight. Weevil seen two in recent days. Weve seen him go nuclear on his opponents, accused ted cruz of cheating in iowa. But weve seen him show incredible restraint. Cecilia, we have never seen him debate after a loss. We just dont know which one will show up. And we will see it 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 the most to lose . Well, its 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. Hes 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. Hes spent more money than any other candidate in this race, and if jeb bush doesnt finish 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 doubledigits. Hes led 70 straight polls since july here. Second place finish, otherwise his campaign is seriously impaired. The whole team here covering it all. Matt, youd be back later. Thank you. The countdown is on for the democratic candidates, too. Bernie sanders, the favorite son here. Hillary clinton, the underdog. She was out going door to door herself today, while he was speaking inside before a packed hall. Abcs david wright is on the trail. Its a Beautiful Day in manchester reporter Hillary Clinton may be down in the polls here in New Hampshire, but dont count her out yet. Well, i need your help on tuesday, and convince some others to come along. Reporter today, shes been out pounding the pavement, knocking on doors, trying to make up ground against bernie sanders. I feel like a rock and roll star. Reporter sanders has accused her of being wall streets favorite democrat. Not progressive enough. I have spent my entire adult life trying to knock down barriers. Reporter today, Madeleine Albright joined clinton, appealing to women, in just remember, theres a special place in hell for women who dont help each other. Reporter but some of the people attending clintons own event agree with sanders. Probably for bernie sanders. Im actually a bernie supporter. Reporter youre a bernie supporter . But youre here at a hillary event . I am. Reporter do you feel like 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 opponents name. Clun clinton took it in stride. There are a lot of young people that support my opponent. But i want you to know, even if you dont support me, i support you. Reporter the sanders surge here is clearly a nuisance for clinton. But it will be interesting to see tonight on that debate stage how seriously the republicans take him. Its a pretty safe bet theyll mention her name more than his. Cecilia . I think thats safe to say. David wright, thank you. And, of course, the debate, just moments away. David muir and Martha Raddatz moderating at 8 00 p. M. Eastern, but we do now move on to other news. To that deadly crane accident in new york. The move that went out of control, and the cranes 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. Abcs phillip mena with the latest on the investigation tonight. Reporter tonight, 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 killing one and injuring three, counterweight into a building. You can see all that debris still on the road there. That damaged building, where part of the crane still lies. What triggered the collapse . Wind and snow conditions. Can figure out exactly what you know, i think youre going to have to give us a couple of weeks at least while we do some engineering calculations, go through the metal and how it failed. Reporter Officials Say the drugs and alcohol, and has been cooperating with the investigation. This crane is so big that workers are having to cut it into 35 pieces just to clear it from the 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. Many women saying that advice goes way too far. Heres abcs gloria riviera. Reporter women across the country, sounding off over the cdcs new alcohol and pregnancy. It just makes no sense to me. Are you serious . Is this really what you feel your sister, your daughter . Reporter while many women support the cdcs longstanding 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 reactionary 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. Reporter the cdc points out, half of all pregnancies in the u. S. Are unplanned. Many women dont 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. Advice, which, it says, was only intended to clearly explain the unborn child. Cecilia . Okay, gloria, thank you. And the debate stage set to take place right here in this hall, its not the only showdown this weekend. The super bowl now less than 24 hours away. Will be watching. The stage is set in san francisco. And abcs ryan smith has the big 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 footballs titans. Alltime great Peyton Manning and the dazzling, dynamic cam newton. You dont go 171 as a starting quarterback without being awesome. Peyton manning will always be an alltime great. Reporter and to set the bar even higher, bruno mars confirming he will be apart of bowl halftime show. Joining coldplay and beyonce. Security, not taking a backseat. Were standing here in one of the Security Operations centers for the super bowl. There are multiple ones so they can back each other up. And what are they looking for . Well, they are looking on the streets, the stadium itself, even the air space, to make sure that super bowl sunday is a safe one. Safety is paramount. For players and fans alike, hoping the 50th super bowl is one for the ages. So, who will win the super bowl here at levis stadium . Las vegas odds makers have the Carolina Panthers at 5. 5point favorites. And while most people we spoke to here have the broncos as the sentimental choice, theyre picking the panthers to win it all. Cecilia . Going to be a good game. 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. Why you may soon be more at risk than ever before. And later, the president of a fraternity at an Ivy League University under arrest. The allegations rocking that km pus. 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Tonight, a warning. Scammers working the phones to get their hands on your money. And those suspicious calls and threats cost americans millions. Heres abcs ron claiborne. Within the next hour, they will be at your doorstep to 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 of dollars in back taxes. And if we dont, theres a warrant out for our arrest. Reporter scared, she wired 10,000 to an account in seattle. It was all a scam. The irs says, since october 2013, 5,000 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 immediate 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 the future, when collectors are actually calling on behalf of the irs, people will be more likely to fall for that scam. Reporter paying taxes they ron claiborne, abc news, new york. Hostage during 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. T type 2 diabetes doesnt care who you are. Man woman or where youre from. City country were just everyday people fighting high blood sugar. I am everyday people. Farxiga may help in that fight every day. Nfarxiga helps lower blood sugar one pill a day helps lower your a1c. 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And a candy giant making some healthy changes. M ms and skittles are getting 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 stul a astill. 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 theyre 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 with onceweekly 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 easytouse pen and i may even lose a little weight. 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It all starts with eating right. Thats why i eat amaz n prunes now. Theyre delicious and help keep my body in balance. I love these. Its 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 passing 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. Heres what you dont know. Underneath those podiums we are in the Athletic Center of st. Anselm. The candidates wont cross paths until theyre ready to take the stage. Take a look at this. This is one of the candidates dressing rooms. You can see whose it is right here. Just to burn off a little bit of steam before a debate, i dont know, maybe he wants to ride an exercise bike . Long hallways. Arrows telling the candidates 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. Its rehearsal time today. The fillins, 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 oneliner . Lets see. I got it down. Im always staring at marco when he says something, too. You totally have it down. Thats really good. Lets see, best Chris Christie face . The whole gang is here. Oh, hi david and martha. Ready to go. And it all starts applause, applause. Still applause. 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. Im cecilia vega in New Hampshire. Thank you so much for watching. And we will see you right back