>> reporter: after earning most iowa caucus goats in g.o.p. history, ted cruz boasted to us he had deied the odds. >> every tv pundit on virtually every station said cruz can't win. there's no chance cruz is going to win iowa. it's not going to happen. it was going to be trump, trump, trump, trump trump. >> reportete butt wasn't. trump fell 6,000 votes short and gave an uncommonly subdued concession speech. >> we finished second, and i want to tell you something, i'm just honored. i'm really honored. >> reporter: but today, the bombast was back. trump complained on twit they're he had not been given any credit by the voters for self-funding his campaign. and that the media has not covered my long-shot great finish in ioio fairlrl trump called cruz's 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 third-place firn marco rubio. >> it's good to see you guys. >> reporter: the florida better position to be the nominee thanruz. who iss closer right now. >> i think i am and i'll tell you why. first of all, we're one delegate apart, dpite the outcome. and i think we have the best chance to unify the party, but also to grow it. >> reporter: but rubio's newfound momentum also comes with new attacks from rivals john kasich, jeb bush, and chris christie, who also need strong showings in new hampshire to stay viable. >> let's see if he'llll answer your questions and stand up and take that because i don't think he will. and you know why, i don't think he can. >> setimes people under duress will react in ways they probably will regegt later into don't take that well. >> reporter: christi finished tenth. cruz worked really hard for his victory in iowa, holding two-thirds as many eventas trump. and when you do the math, trump collected twice as many votes per iowa visits than cruz. >> pelley: worth remememring they haven't picked the nominee now we go to the democrats and here is nancy cordes. >> i am so thrilled that i'm coming to new hampshire after winning iowa. ( cheers ) >> reporter: the first woman ever to win the iowa caucuses did it by .2 of 1%. arar you conceding the race in iowa? >> 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 takak 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 caucus-goers were 50 up and and the granite state is rockier territory for clinton. the latesescbs news battleground tracker shows sanders leading in new hampshire by 19 points. his democratic socialist message plays well with the state's large independent population. >> it sounds to me like you're ready for a political revolution. ( cheers and applause ) >> reporter: sanders also has something of a home field advantage here. he is from neighboring v vrmont, 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 o'malley. clinton picked up 22 national convention delegates in iowa, sanders 21, but that's a little 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 clinton's way. on the republican side, cruz pickedp eight delegates, trump and rubio seven. ey 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? what's the new framework? >> reporter: well, we've been talking about this race in terms of the establishment versus the outsiders. but we should maybe look at it in terms o o the ideologog 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 the large share went to marco rubio. going into new hampshire, ted cruz is saying i'm the true consistent conservative, the keeper of the flame, rally to my light. marco o bio 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 did well in iowa i i part because he did better than expectations but now that he's saying he's in the top tier, he is the alternative to cruz and trump, those expectations are very high. so he would have to do very well in new hampshire, which is a less-ideological 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 willl continue between ted cruz and donald trump. >> pelley: john dickerson. we'll 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 a person in dallas was infected after sex with a partner who had been in venezla, where zika is epidemic. it's usually transmitted by mosquitoes, and it's suspected of causing devastating birth defes. hardest hit is brazil, where we find dr. jon lapook. >> reporter: it's a search-and-destroy mission by government workers. each morning, teams of army and health workers target neighborhoods in the city of retief, lookingo 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 city's 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, two months. 30-year-old 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 species of mosquitoes occurs in people's home. what are you doing at home to lower your chance of getting bitten by a mosququo? 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. e's had no obvious symptoms of zika, but 80% of the time, those infected don't feel sick. what do you worry about? "prejudice exists and is seriouou as a mom, i would give all my love, but i would worry about the outside world." scott, i asked health mmissioner correia about the he said that has not been reportedreportedreported inreported in brazil but health offifials here are expececd 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 news facebook page. so what are the chances of a large outbreak of zika in this country? we put the questiono dr. thomas frieden who runss the centers for disease control. >> everything that we've seen so far doesn't suggest that there will be a widespread outbreak of zika in the u.s. we have two things going for us. first, t t mosquitoes arere not present at all in most of the country, and they're present in much lower numbers where they are present. second, because people have air conditioning, are inside, are less crowdeded than some of the place where's zika is spreading so rapidly, we're much less likely to have that kind of widespread transmission, even in 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 war-torn somalia today, and margaret brennan has that. >> reporter: cell phone video shot on the plane while still in 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 people were injured. the somali-owned airline was on its way from mogadishu to djibouti, when minutes after 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 it's unclear if that's from a structural failure or a bomb. scott, the al qaeda-linked terror group al-shabaab 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 helmut-to-helmut hits. john blackstone is looking into this. >> reporter: after former new york giant tyler sash died at the age of 27, doctors were degenerative brain disease, unusually a aanced in someone soo young. his mother, barnetta, blames football. >> they could have all the money back if i could just have my son back. i don't-- you know, nothing else matters. and you can't compensate anybody enough for that. >> if you continue to deny my work -- >> reporter: in the movie "concussion," will smith pys dr. bennet omalu,he pathologogt 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. >obody 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? the profefeional players willl suffer from c.t.e. >> i think that's a bit of hyperbole, quite honestly. i can't 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 league has made dozens of rule changes top reduce the risk. an athletic traiair dubbedd "eyee in the sky" watches for injuries from a stadium box, and an independent neurological consultant monitors from the sidelines. >> concussions are up, and i thenk it's 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 damage those blows to the head may be causing, and, scott, the nfl is looking at equipment changes and even newinds of turf that could reduce head injuries. >> pelley: john blackstone reporting for us. john, thank you. a mother remembers her murdered daughter was the killer online? and snow plows overwhelmed by a severe storm when the cbs evening news continues. if a denture were to be put under a microscope, polident's unique micro clean formula works in just 3 minutes, killing 99.99% of odor causing bacteria. for a cleaner, fresher, brighter denture every day. my dad gave me those shares, you know. he ran that company. i get it. but you know i thihi you own too much. gotta manage your risk. an honest opinion is how edward jones makes sense of investing. 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. they're delicious and help keep myody in balance. i love these. sunsweet amaz!n prunes, the feel good fruit. hey! this is lloyd. he's agreed to give it up. ok, but i have 30 acres to cover by sundown. we'll be with him all day as he goes back to taking tylenol. yeah, i was ok, but after lunch my knee started hurting again so... more pills. yep... another pill stop. can i get my aleve back yet? for my pain... i want my aleve. get all day y nor arthritis s in relief with an easy open cap. >> pelley: nicole lovell battled illness and bullying and lived much of her short life online. saturday in virginia, she was found murdered. two college freshmen are under arrest, and don dahler is following this. >> reporter: at a press conference, nicole lovell's mother, tammy weeks, tried to describe the daughter she called colie. she uldn't finish. >> colie had a passion for "american idol." nicole touched many people throughout her short l le. yeah, i can't do that part. >> reporter: prosecutors have charged 18-year-old david eisenhauer with first degree murder and his fellow virginia tech engineering student 19-year-old natalie keepers is now charged with helping him commit the crime. commonwealth's attorney mary pettitte. >> a very preliminary determination of the cause of death is stabbing. >> reporter:r:isenhower is a former high school track star. according to police documents, he first told investigators, "i believe the truth can set me free." 13-year-old lovell, who had survived a liver t tnsplant, wasas last seen at her mother's blacksburg, virginia, home last wednesday. her body was discovered saturday lying on a road in north carolina. lovell's father, david, a a her step-mother, terry, stayed in touch with the teen through social media but they were concerned about her activities on some web sites where the 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 didn't do enough. >> reporter: the suspects are 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. whwhpause to take a pill? or stop to find a bathroom? cialis for daily use is approved to treat both erectile dysfunction and the urinary symptoms of bph, like needing to go frequently, day or night. tell your doctor abobo all your medicalalonditions and medicines, and ask if your heart is healthy enough for sex do not take cialis if you take nitrates for chest pain, or adempasor pulmonary hypertsion, as it may cause an unsafe drop in blood pressure. side effects may include headache, upset stomach, delayed backache or muscle ache. to avoid long-term injury, get medical help right away for an erectn lasting more than four hours. if you have e y sudden decrease or loss in hearing or vision, or any symptoms of an allergic reaction, stop taking cialis andndet medical help right away. ask your doctor about cialis and a $200 savings card everyone's lookin' red cacaet ready. my m m, lemme guess who you're wearing... toenail fungus!? 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that resonates. and a brand that sticks for years to come. just one look >> reporter: demarco morgan, cbs news, new york. >> pelley: and that's the cbs evening news for tonight. for bll of us at cbs news all around the world. good night. captioning sponsored by cbs right now on cbs 2 news, winter wrath.where the snowfall is impacting people the most and how its affecting those needing to vote in school elections. elections.plus ...post- post caucus crunch, how tight races and record turnouts in iowa are setting the tone. right now cleanup is behind frorothe winter storm. this is video we shot earlier today in cedar rapids. how much snow yoy received it depended on where you live but one thing we share is the wind that i istarting to pick up. >> things are constantly changing in fact, this just in. we have a dense fog advisory in effect until midnight. we are seeing reduced villas ability, be mindful of that if you are on the roads. it is foggy out there, you can barely see the headlines on interstate 80. it is reduced down to 3 miles in cedar rapids. as you get north down to 1 mile as well. be mindful of that. if you are heading homo tonight because we also have strong