Made history today, though not the way she hoped. She was declared the winner of iowas Democratic Caucuses by the smallest margin ever. Now she faces a tougher battle against Bernie Sanders on his new england home turf next week. New hampshire is also where Republican Donald Trump will be looking for a comeback after losing to ted cruz and barely edging out marco rubio. Our campaign 2016 correspondents are on the trail, and first well go to Major Garrett with the republicans. God bless the great state of New Hampshire. applause so what a victory last night. cheers reporter after earning most iowa caucus goats in g. O. P. History, ted cruz boasted to us he had deified the odds. Every tv pundit on virtually every station said cruz cant win. Theres no chance cruz is going to win iowa. Its not going to happen. It was going to be trump, trump, trump, trump, trump. Reporter but it wasnt. Gave an uncommonly subdued concession speech. We finished second, and i want to tell you something, im just honored. Im really honored. Reporter but today, the bombast was back. Trump complained on twit theyre he had not been given any credit by the voters for selffunding his campaign. And that the media has not covered my longshot great finish in iowa fairly. Trump called cruzs victory speech long, rambling, and overly flamboyant. Trump still holds large leads in New Hampshire polls but the race is quickly become a battle among trump, cruz, and iowa thirdplace firn marco rubio. Its good to see you guys. Reporter the florida senator says he is now in a better position to be the nominee than cruz. Who is closer right now. I think i am and ill tell you why. First of all, were one delegate apart, despite the outcome. And i think we have the best chance to unify the party, but also to grow it. Reporter but rubios newfound momentum also comes with new attacks from rivals christie, who also need strong showings in New Hampshire to stay viable. Lets see if hell answer your questions and stand up and take that because i dont think he will. And you know why, i dont think he can. Sometimes people under duress will react in ways they probably will regret later into dont take that well. Reporter christi finished tenth. Cruz worked really hard for his victory in iowa, holding twothirds as many event as trump. And when you do the math, trump collected twice as many votes per iowa visits than cruz. Pelley worth remembering they havent picked the nominee since 2000. Now we go to the democrats and here is nancy cordes. I am so thrilled that im coming to New Hampshire after winning iowa. cheers reporter the first woman ever to win the Iowa Caucuses did it by. 2 of 1 . Are you conceding the race in last i saw we were four delegates down. As i understand it, there were some precincts actually where delegates were won with the flipave coin. So we want to take a look at that. Tails reporter at least six precincts broke a tie with a coin toss. Hillary clinton. cheers reporter the large turnout, evenly split, caused challenges elsewhere, too. We should do a realignment. Reporter in the end, 84 of young voters under the age of 30 went for sanders, but of caucusgoers were 50 up and and they went overwhelmingly for clinton. The Granite State is rockier territory for clinton. The latest cbs news Battleground Tracker shows sanders leading in New Hampshire by 19 points. His democratic socialist message plays well with the states large independent population. It sounds to me like youre revolution. cheers and applause reporter sanders also has something of a Home Field Advantage here. He is from neighboring vermont, but crts has deep ties here, too, scott. It is here that she stage aid comeback eight years ago after a stinging floss iowa. Pelley nancy cordes for us tonight. Nancy, thank you. Two carn ults of the Iowa Caucuses mike huckabee, who won there eight years ago, did poorly last night and dropped out, and so did democrat martin omalley. Clinton picked up 22 National Convention delegates in iowa, sanders 21, but thats a little misleading because clinton already has 362 super delegates, Party Leaders who pledged their votes to her. That brings her now to 384 or about 16 of the 2382 she needs. After New Hampshire, the polls indicated the primaries are expected to break clintons way. On the republican side, cruz and rubio seven. They need a little over 1200, so far to go. John dickerson is our cbs news political director and anchor of face the nation. Well, john, as we just heard what, a difference an election makes. Tell me, how is the race changed . Whats the new framework . Reporter well, weve been talking about this race in terms of the establishment versus the outsiders. But we should maybe look at it in terms of the ideology versus electability. If you look at the entrance polls in iowa, those who were asked, who shares your values . Overwhelmingly they went for ted cruz. When people were asked, who do you think can win in november . The large share went to marco rubio. Going into New Hampshire, ted cruz is saying im the true consistent conservative, the keeper of the flame, rally to my light. Marco rubio is saying i can beat hillary clinton. Pelley a question of ideology and electability. Tell me, where does this go from here . Reporter well, marco rubio he did better than expectations but now that hes saying hes in the top tier, he is the alternative to cruz and trump, high. So he would have to do very well lessideological state. Of course, he has new competitors there in bush, christi, and kasich, all of whom want to crag him down, and, of course, there is still the roiling fight that will continue between ted cruz and donald trump. Pelley john dickerson. Well be watching on sunday on face the nation. John, thanks so much. Now, in another important story tonight, Health Officials have confirmed the first transmission of the zika virus in the united states. A person in dallas was infected after sex with a partner who had been in venezuela, where zika is epidemic. Its usually transmitted by mosquitoes, and its suspected of causing devastating birth defects. Hardest hit is brazil, where we find dr. Jon lapook. Government workers. Each morning, teams of army and Health Workers target neighborhoods in the city of retief, looking to kill mopses that may carry the zika virus. Recife is the epicenter of the explosion of microcephaly, an abnormally small head at birth linked to the infection. Each is a notified case of microcephaly. Reporter dr. Jailson correia heads up the citys health department. We are expecting now to reduce the mop plaigz of mosquitoes to see less zika infection in 2016 and hopefully less microcephaly cases later on. Reporter there are 72,000 homes in this district alone, and officials follow up every two months. 30yearold Silvania Borges is pregnant with her fourth child. A worker added a chemical to kill mosquito larvae at a water storage nairchg her house. The majority of breegd of this what are you doing at home to lower your chance of getting bitten by a mosquito . Borges told me she tries to keep her home clean, eliminate standing water, and occasionally uses bug spray. Still, she gets mosquito bites about once a week. Shes had no obvious symptoms of zika, but 80 of the time, those infected dont feel sick. What do you worry about . Prejudice exists and is serious. As a mom, i would give all my love, but i would worry about the outside world. Scott, i asked Health Commissioner correia about the sexual transmugz of zika virus in the united states. He said that has not been reportedreportedreported inreported in brazil but Health Officials here are expected to take a closer look. Pelley like us you probably have a lot of questions about zika, and after this broadcast, dr. Lapook will do a live chat on the cbs evening so what are the chances of a large outbreak of zika in this country . We put the question to dr. Thomas frieden who runs the centers for disease control. Everything that weve seen so far doesnt suggest that there will be a widespread outbreak of zika in the u. S. We have two things going for us. First, the mosquitoes are not present at all in most of the country, and theyre present in much lower numbers where they are present. Second, because people have air conditioning, are inside, are less crowded than some of the place wheres zika is spreading so rapidly, were much less likely to have that kind of widespread transmission, even in those place wheres there are the mosquitoes that spread this virus. Pelley dr. Thomas frieden of the c. D. C. Now, turning overseas, there was a bang and suddenly a gaping hole in a jetliner over wartorn somalia today, and Margaret Brennan has that. Reporter cell phone video flight shows oxygen masks blowing in the wind near the hole in the airbus 321. Some passengers towards the back of the plane can be seen wearing their own oxygen masks. Once on the ground, the damage to the plane was clearly viblg with pieces of the fuselage curled out from the body of the plane. All 74 passengers and crew were evacuated. Aviation Officials Say two people were injured. The somaliowned airline was on its way from mogadishu to djibouti, when minutes after takeoff the rumpt ripped a hole in the fuselage. After the smoke cleared he realized quite a chunk of the plane was missing. U. S. Intelligence officials are aware of reports that there may have been an explosion but its unclear if thats from a structural failure or a bomb. Terror Group Alshabaab controlled part of the country, and isis is expanding its footprint. Pelley Margaret Brennan in the washington newsroom tonight. Margaret, thank you. Now, five days ahead of super bowl 50, the nfl is studying how to deal with a 58 increase in concussions from 115 during the 2014 season to 182 in 2015. This after the League Already cracked down on helmuttohelmut hits. John blackstone is looking into this. Reporter after former new york giant tyler sash died at the age of 27, doctors were shocked to discover he had a degenerative brain disease, unusually advanced in someone so young. His mother, barnetta, blames football. They could have all the money back if i could just have my son back. I dont you know, nothing else matters. And you cant compensate anybody if you continue to deny my work reporter in the movie concussion, will smith plays dr. Bennet omalu, the pathologist who first identified the brain disease chronic tramatic encephalopathy or c. T. E. In football players. He battled the football establishment to have it recognized. Nobody is denying c. T. E. Any longer. Reporter dr. Omalu has studied the brains of dozens of deceased nfl players. How many of the players on the field on super bowl sunday will already be suffering from brain damage . I believe that 90 to 100 of the professional players will suffer from c. T. E. I think thats a bit of hyperbole, quite honestly. I cant imagine that being the case. Reporter dr. Mitch berger, a brain surgeon, is chairave commit they monitors head injuries for the nfl. Over the past decades, the changes to reduce the risk. An athletic trainer dubbed eye in the sky watches for injuries from a stadium box, and an independent Neurological Consultant monitors from the sidelines. Concussions are up, and i think its primarily because of the vigilance. So because of the affiliated neurotrauma consultant, because of the spotter in the media box, there were twice as many evaluations or screenings for concussions this year. Reporter but dr. Omalu believes it takes less than a concussion to damage the brain. So by the time you reach a professional level, you must have received thousands if not hundreds of thousands of blows to your head. Reporter dr. Omalu now has a foundation to research the damage those blows to the head may be causing, and, scott, the nfl is looking at equipment changes and even new kinds of turf that could reduce head injuries. Pelley John Blackstone reporting for us. John, thank you. Was the killer online . 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According to police documents, he first told investigators, i believe the truth can set me free. 13yearold lovell, who had survived a liver transplant, was last seen at her mothers blacksburg, virginia, home last wednesday. Her body was discovered saturday lying on a road in north carolina. Lovells father, david, and her stepmother, terry, stayed in touch with the teen through social media but they were concerned about her activities on some web sites where the family believes she ultimately met her accused killer. Were you aware that she was active on these teen flirt sites . We knew that there were some issues at one time with her on these sites, and we addressed them, and i guess we didnt do being held at this jail without bond. They have not yet entered a plea, scott. Nicole lovell, her funeral will be held on thursday. Pelley don, thank you. Snow stretches for 1,000 miles. Next. Got interesting. Why pause to take a pill . Or stop to find a bathroom . 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So look for powerful Cold Medicine with a heart. Pelley the candidates got out of iowa just one step ahead of a storm that could still spawn tornadoes. Heres david begnaud. Reporter tonight, a blizzard is sweeping across much of middle america. The zone of snow extends from colorado to wisconsin. More than 13 Million People are under the threat of winter weather. Nearly a foot of snow has fallen in colorado alone in just 24 hours. In kansas, vehics had to be dug out. Blowing snow has made driving treacherous, with little visibility. Big rigs have become stranded. Some sedans didnt even have a chance. Even snow plows were struggling. 1600 customers in lincoln, nebraska, where monie and lee hetrick live. Its a moment where you go back to where people didnt have power and you have to learn how to adapt. Reporter elsewhere today it was unusually warm from chicago to new orleans. Nashville set a record 75 degrees. 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Ask a urology specialist today people are coming out to the Nations Capital to support an important cause that can change the way you live for years to come. How can you help . By giving a little more, to yourself. I am running for my future. People sometimes forget to help themselves. The cause is retirement, and today thousands of people came to race for retirement and pledge to save an additional one percent of their income. If we all do that we can all win. Prudential bring your challenges Democratic Caucus winner. The race were incredibly close. Problems. Pelley the super bowl is coming sunday here on cbs, but first a word from the sponsors. Heres demarco morgan. Each morning i get up, i die a little. Can barely stand on my feet. Take a look at yourself in the mirror. And cry reporter these singing sheep hope to have football fans flocking to their honda dealers, but whether youre an animal lover your skittles portrait. Reporter on who a sweet tooth and the mood to go an octav higher. I think a little higher. Dream on reporter get ready to be flooded, knocked over, and entertained by this years super bowl ads. Its hard to resist great taste. Reporter ken wheaton, editor of ad age. What does the super bowl mean to advertisers . The super bowl for advertisers is one of the last big things for them to put their brand in front of the most people in america. Shelling out 4. 8 million on average for a 30second spot. Thats 160,000 per second. Over here we have their alphabet. It was called emoji. Reporter last of during last years super bowl, smaller brands like avocado from mexico spent 10 of their budget for an ad. He double dipped. Reporter Company President alvaro luque. Were trying to give an example to other brands that could be participating participate there and compete or share the stage with this huge brand. Reporter his brand grew 33 . The lesson . The ad that wins has a message that resonates. And a brand that sticks for years to come. Just one look reporter demarco morgan, cbs news, new york. Pelley and thats the cbs evening news for tonight. For all of us at cbs news all around the world. You are watching kcci eight news. Anchor winter is finally declared in the Democratic Caucus. Questions remain. Anchor and classes canceled, elections postponed and vehicles in the ditch because of morning snow. How much more we could get tonight and who was hard to pick. The snow stopped by this afternoon but does that mean the metro areas in the clear. Here it jason. The bulk of the snow has fallen. You can see another inch out of what we have left of this. We only have two and a half so far