The Iowa Caucuses 24 hours from now. A late poll has the democratic race clinton versus sanders a tossup. As for the republicans, trump and then cruz and on the ground, getting out the vote is where this first in the nation battle will be won. Our team is in the thick of it tonight. Lets start with nbcs kristen welker. Lester, good evening. Tonight both campaigns tell me theyre expecting this to be close. There have been tens of thousands of tv ads. Phone calls and door knocks. Now it come down to turnout and the final pitch from the candidates. Its the homestretch. Hillary clinton and Bernie Sanders blanketing iowa. A fight for the number one spot in a race likely to be a photo finish. Monday night could be an historic night for this country. We can make history. Lets start a storm of Movement Toward the make together reporter just hours before voters caucus, clinton and sanders in a statistical dead heat. 45 to 42 . Getting people out to vote tomorrow is todays top priority. Teams of volunteers and organizers knocking on doors one last time. Making sure every supporter knows two things where their caucus location is and how theyll get there. And the Clinton Campaign allowing nbc an exclusive look at their specially developed app which is like a caucus night calculator helping them keep close tabs on caucusgoers and how theyre voting tomorrow. It allows us to streamline the process and help the precinct be able to move more quickly through the process. So theyre spending more time calculating and less time persuading. And clinton averaged 125,000 door knocks alone. Team members are in place. And sanders ground team equally impressive. Volunteers. Today, clinton still playing defense on her private emails when she was secretary of state. I just have to point out that the timing and some of the leaks that have led up to it are concerning. Reporter sanders whos been reluctant to engage in the email issue today weighed in on meet the press. I think this is a serious issue. Im not going to attack Hillary Clinton. The American People have will have to make that judgment. Reporter with the clock ticking voters are now ready to have their say. Who are you supporting . Bernie sanders. Hillary clinton . I think she has the most experience. She can do the job. Reporter sanders could win iowa if young voters turn out in force. One Campaign Official telling me tonight win or lose, sanders is in this race for the long haul. Lester . All right, thank you. The margin a bit wider in iowa among the republicans although donald trump is with ted cruz working hard to close that gap. Hallie jackson has the gop field covered for us tonight. Reporter in the final crunch before the caucuses, even Church Becomes a campaign stop. I pray that gods will will be done. Reporter but the signs of peace giving way to the battle on the campaign trail. Donald trump supports expanding obamacare. To make it full on socialized medicine like Bernie Sanders. Look, ted cruz is the total liar. I am so against obamacare. Im going to repeal an replace obamacare. Reporter trump looking strong still suitably starting to tamp down expectations. Arguing he doesnt have to win this state. Id like to win iowa. Im doing really well with the evangelicals in iowa. Reporter they both know that christian support can be the deciding factor. Six in ten caucusgoers identified as evangelical the last couple of cycles. If the same number turns out tomorrow, it whats going to be important for you in that caucus room . I think whats most important to me when i go to the caucus, i want somebody who obviously shares the same values that i have. As a christian, as a bible believer. Reporter pastors at New Hope Church clear on what they want from a nominee and what they dont. Im disappointed that people will tell us when they get to washington theyre going to do this. Im disappointed that the republicans and democrats cant Work Together to make better laws that reach across the aisle and that benefit all americans. Reporter that frustration one of the biggest factors fuelling outsiders like trump and cruz here. Very frustrated with both parties. Although i have faith that it can be corrected. Reporter thats gary warm bure at A Marco Rubio rally. It can last long past iowa and the starting the real poll is that matters is tomorrow night. The poll matters is what we actually do, right . Not necessarily what all the media tells us to do. Reporter and late today, a memorable moment on the trail when cruzs bus got stuck in the mud. They hope thats not a metaphor for tomorrow night. And new polling Shows Nearly Half of likely republican caucusgoers could still be convinced to change their mind, lester. And if they do its ted cruz who stands to benefit the most. Hallie jackson, thank you. Andrea mitchell has been following the twists and turns and start with the democrats. Its an election that you have outsider democrats drawing big crowds but Big Questions on whether they can deliver the crowds on the caucuses. On the democratic side, Hillary Clinton on organization but shes fighting off that Bernie Sanders surge. 83 of the clinton supporters have made up their mind compared to 69 for sanders. Clinton will be using the playbook that barack obama used to defeat her eight years ago. Everything will depend on turnout. Campaign insiders say if only 170,000 people were to vote, then she wins. If more than 200,000 show up, as they did for obama, then sanders would carry the day. Its a lot at stake. If sanders were to win here, he would have big momentum going into New Hampshire where hes already way ahead and that would be a real crisis. The republican side has the trump surge be real, how will the ground game play out . The question is whether that surge is real. He now leads cruz by five points. Its clear his attacks on cruz have taken their toll since cruz was leading trump a month ago. Again, the issue is organization. Trump has the bigger crowds, but the polls dont suggest a ground swell of new voters. Cruz has been on the road more in iowa and by tomorrow night he all 99 counties if he gets that bus unstuck. The Party Leaders are in a near panic about a Trump Victory because it will give him a huge start to the nomination. They worry about cruz who has been fighting with the Party Establishment so Top Republicans are hoping that marco rubio could come in a strong third. Going to be a big day. By the way, there could be snow. A strong yeah, the campaigns are closely watching the weather here in iowa. Because it could impact caucus turnout. So a swath of snow is in fact heading directly to the state. Not expected to hit until late monday night, but iowa is one of 15 states under winter storm advisories. Tonight, 3 Million People are under blizzard watches or warnings with up to a foot of snow across the plains and midwest. Theres late word in the second arrest of the murder of a girl. Two Virginia Tech students are being held without bond as Kristen Dahlgren has details. Reporter in blacksburg, virginia, sadness and shock. Everyone is still trying to wrap their mind around even the news. Reporter news that two Virginia Tech students are now being held in connection with the murder of 13yearold nicole lovell. Freshman David Eisenhauer is charged with abduction and first degree murder. 19yearold natalie keepers with improper disposal of a body and accessory after the fact. Lovell was last seen on thursday, a massive search scouring the area for the teen. A liver transplant recipient, dependent on medication to stay alive. That search led them to eisenhauer from virginia. And then, lovells body, about 100 miles from home. According to police, eisenhauer and the young teen knew each other before her disappearance. Eisenhauer used this relationship to his advantage to her. Keepers helped eisenhauer dispose of nicole body. Reporter today, state police searched a pond on the Virginia Tech campus. This weekend lovells father posted on shock. Say. Im broken. A fathers unspeakable pain as an entire community now comes together to mourn. Kristen dahlgren, nbc news. In the next 24 hours the World Health Organization will make a major decision about zika and whether to declare it a Global Public health emergency. In brazil ground zero for the outbreak the government is struggling to protect and educate people about the virus. Our rehema ellis talked to one trying to help protect residents. Reporter in a park in haditha, texas native Dennis Dowling is on a mission. Working with poor families hes in brazil for 30 years. The zika virus. How hard is it to communicate this message to protect yourself . Its very difficult. A lot of times they dont flow what the consequences are, what the dangers are. Reporter for 19yearold anna payola, the message hits home. Two months pregnant she had zika like symptoms. A fever, rash and body aches. She said shes worried the virus thats been linked to birth defects and brain damage in infants could affect her baby and doctors told her to use insect repellent and protective clothing. But no long sleeves. Not surprising in this land of sun and skin. Now preparing for carnival later this week. Part of the festivities constant reminders to beware of mosquito. This 13yearold is learning about zika in school. To the north of brazil, colombia is the spread of zika. Fumigation trucks are going street to street in the hard hit Northeast Corner of the country. Colombia reports more than 20,000 cases of zika. Among them, 2,100 pregnant women and the government is urging women to delay pregnancy. The news comes before the World Health Organization convenes for a rare emergency meeting tomorrow. To decide whether to declare a Global Public health emergency. Back here in brazil, the epicenter of the outbreak, life goes on. But many families worry about the virus and what it means for their future. Rehema ellis, nbc news, brazil. When nightly news continues on a sunday night, why some people think living on the greek islands and the eye of the refugee storm should get a very important recognition. Plus, well show you what happens when getting the right nutrition each day is important, but drinking an entire full size nutritional drink can be a challenge. Try new boost compact nutritional drink. The only drink that provides complete nutrition in half the size of other nutritional drinks. Boost compact is filled with 10 grams of protein, to help you get the nutrition you need. Try new boost compact nutritional drink today. This has been medifacts for boost. 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Reporter they have seen many drown, others dying from extreme cold. Like a war zone were in. We have had lots of people that have not made it. Reporter another rescue, this one a boat load full of children under 12. Volunteer medics rush where the islands doctors despair of a war without end. I feel very sad and im very angry about this. Reporter everyone here has been deeply affected. People just walking their dog on the beach dont expect to find the body of an 18monthold child in the morning on a dog walk. Its not good. Reporter for their courage and sacrifice, the islanders are now being nominated for the nobel peace prize. When they make such an honor, that means a lot. Reporter but not everyone on the island is celebrating their nomination. We need to stop this. I dont want the people to be dying this way. Reporter the islands lifeblood, tourism is dying too. That they fear the nobel prize will bring that back. Youre afraid . Nothing but a peace rescuing the victims of war. 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The diverse winners of the screen are a stark contrast. And our Steve Patterson tells us about the message that they had for academy winners. Reporter the night could be summed up with one sentence thank you, gentlemen. Welcome to diverse tv. Reporter one of several statues awarded to the nonwhite nominee at this years annual Screen Actors Guild i nominees. To the red carpet, this was hollywoods night to show case diversity. This is what we talk about when we talk about diversity. Reporter all in direct contrast to the academy awards. No a single actor of color up for a win. Viola davis said its an ongoing battle. We are a society of trending topics. Diversity is not a trending topic. Reporter but this a viral discussion. The oscars so white year in a row, now a hollywood boycott with the academy making change,s to diversify the membership. I think the s. A. G. Award winners was a rebuke not to nominate any nonwhite actors. Reporter theres a voters. The s. A. G. 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