Donald trumps momentum and counter a late surge prosecute marco rubio. The cruz and rubio campaigns are pulling out all the stops, including hardball voter turnout tactics. The leader in iowa a month ago, ted cruz, is now running behind donald trump. Damaged by trumps canadian birther allegations and charges hes a calculating not consistent conservative. We dont view any state as i must win. I think were positioned to do very well in iowa. Reporter the latest Bloomberg PoliticsDes Moines Register poll has trump ahead by 28 , cruz 23 . Cruz will visit his 99th and final iowa county on monday. Cruz has elaborate files on the most reliable voters here, evangelical christians and tea party enthusiasts. The campaign sent this flier to voters with their voter propensity score that looks like a government doult, but isnt. The point, to shame those to caucus for cruz and bring friends listed. It is to dishonest. Reporter trump attended church this morning. For the first time, said he would appoint Supreme Court justices to overturn gay marriage. A big issue for iowas social quemp conserve conservatives. I disagree with the Supreme Court. It should be a states rights issues. Reporter trumps frontrunner stat us and rulebreaking ways allowed him to skip the final televised debate and attract Rick Santorum and mike huckabee. Im endorsing myself. The first thing out of my mouth that night are donald trump and i are competitors but colleagues when it comes to supporting veterans. Reporter santorum told us hes tried to steer clear of trump. I think i was pretty clear that night when i stood to the side of the podium and said, i dont want to stand behind a trump sign because im supporting another candidate tore president. And i intend to run a vigorous im nancy cordes. Its an honor reporter there is no poll that can tell you were calling with the Hillary Clinton campaign. Reporter which democrat has the better ground game. Im glad to hear youll be supporting the governor. Reporter in a race as close as this one there is nothing more important. The candidates made their closing arguments today. And theres a big difference between what i believe will work and what the republicans are selling. Reporter clinton has done more than 100 events in iowa. Sanders isnt far behind. Starts working for all of us, not just the 1 . Reporter the newest Des Moines Register poll shows the two separated by just three points. That means former maryland governor, Martin Omalley, who is polling at 3 , could become a kingmaker. I would love to be the second clinton people. Reporter caucuses allow supporters to horse trade with one another. Clinton and sanders camps will try to convince omalley voters to work with him. The longest his people hold out, the more leverage they have. My message to the omalley supporters across the state is this, hold strong at your caucus. Reporter his troops know their marching orders. Im Holding Strong on caucus night. The hold strong message is our conviction. Reporter nancy is a omalley volunteer and saw the strategy work before when she was a precinct captain for president obama. I remember in 08, went to talk to the biden group, and that only got them to come over. But two other people there ended up being two of my top volunteers for obama. So, its pliable. Reporter and so omalleys final tally tomorrow night could outstrip his poll numbers if the other two swing supporters his way in an attempt to depress each others delegate count. It is very complicated, jeff. Which is why even at this hour here at sanders headquarters, they are still sending volunteers out into the streets support. Thank you, nancy cordes, Major Garrett and our entire team in iowa. Peace talks aimed at ending the war in syria are getting under way in geneva, switzerland. Allen pizzey reports as syrians continue to die inside their country and trying to escape. We warn, the footage is graphic. Reporter this tushish beach is a long way and no distance at all from the wouldbe peace talks in geneva. Even as the participants argued over whether or not to actually get down to business, drowned children and their families fleeing the conflict washed up on shore. By some counts, 35 times more people have tried to make the perilous crossing to greece, at drowned this month alone. This is the type of horror that makes them take the risk. Dozens were killed in damascus when a car bomb went off. Two suicide bombers then struck rescuers, adding to the carnage. Syria today is an unfolding humanitarian catastrophe. Reporter in a video message secretary of state john kerry called on participants in the peace talks to seize the opportunity to bring an end to the conflict. The talks are supposed to begin in some form on monday. This conflict could easily engulf the region. If left to spiral completely out of control. That is what the negotiations in geneva can prevent. Reporter but so far, the parties to the talks are refusing to even speak directly to each other. In spite of the messages from adaa damascus suburb. Will be right back. Almost sixty million americans are affected by mental illness. Together we can help them with three simple words. My name is chris noth and i will listen. From maine to maui, thousands of High School Students across the country are getting in on the action by volunteering in their communities. Chris young action teams of High School Students are joining volunteers of america and Major League Baseball players to help train and inspire the next generation of volunteers. Carlos pea its easy to start an action team at your school if you were a hippie in the 60s, you need to know. Its the dawning of the age of aquarius. Yeah, and Something Else thats cool. What . Osteoporosis is preventable. All osteos preventable . Right on if you dig your bones, protect them. All cbs cares two Virginia Tech students were arrested this weekend in connection with the death of a 13yearold girl. As Jericka Duncan reports, Police Believe she was murdered. Reporter police say 13yearold Nicole Lovell was abducted by David Eisenhauer and they say keepers helped him. Blacksburg Police Detective we have determined they were acquainted prior to her disappearance. Reporter saturday authorities charged eisenhauer with murder. They found lovells remains about 100 miles from her home. Her family reported her missing on wednesday and say her dresser was pushed up against her bedroom door. A missing child poster noted she required medication daily for her liver. Friday, her father posted this message to facebook. Nicole, honey, if you see this, if youre out there, you can come to me. Im not mad at you. Im worried about you. Your familys worried about you. Just come home. Reporter nicoles Facebook Page shows she was a member of at least one teen dating group, but its unclear whether she met eisenhauer on line. Last march the track and field state champion was honored as i will personally not stop until i reach my peak performance. Reporter investigators spent four days searching for lovell. State Police Continue to search for evidence on the Virginia Tech campus. Virginia tech released a statement extending its support to lovells family and friends. Police have not released a motive or cause of death. The oobs isautopsy is scheduled for tomorrow. Thank you very much. The super bowl teams arrived in the bay area today, one week ahead of the big game. The Denver Broncos landed about an hour before the carolina panthers. Behind the scenes, teams of federal and local Law Enforcement officials are finetuning their security plans for the super bowl. John blackstone has an inside look. Reporter celebrating the biggest week in football, San Francisco is expecting 1 million visitors a day. Six blocks downtown has been turned into super bowl city. Its a place where football fans big and small can play photos. But first, they will have to line up to go through metal detectors. San franciscos police chief. There will be officers in plain clothes, on high ground, but a lot of it will be unseen to the regular person thats just going to come and have a great time in San Francisco. Reporter Law Enforcement agencies have been planning for this for two years. Coast guard canine units are on hand to screen the crowd for explosives. The fbi brought bombdetecting robots just in case. Dozens of federal, state and local agencies have set up a joint operations center. David johnson is in charge in San Francisco. Really what this facility is for is to collect information, thread information, intelligence, analyze it and get it out to the people that need to know. Reporter geography is making security planning more difficult. While many events are taking place in San Francisco, levi stadium is 45 miles away in thats where 70,000 people will gather for the game next sunday. While fbi Officials Say theres no known credible threat of a terror attack, an individual working alone can present a clear danger. Its all about identifying the lone wolf before he or she acts. Hard to find. Absolutely, no doubt about that. I think we saw that in san bernardino. Reporter part of the security plan depends on all these fans being watchful as well. At every opportunity, jeff, San Franciscos police chief repeats the phrase, if you see something, say something. John blackstone, thank you. El nino continues to soak parts of california. Highway 101 in Ventura County was flooded today. Conditions at the farmers open in la jolla were very bad. Some parts of the state were expecting up to 3 inches of rain. Multiple delays at the golf tournament. That is helpful in battling drought, the rain, but unhelpful insidious problem cliff erosion. Heres carter evans. Reporter relentless el ninopowered waves are taking a human toll. But this crumbling Hillside South of San Francisco is giving scientists a gold mine of information. The nature conserve ancy has asked Drone Operators to capture a perspective rarely seen. Drones provide this really great perspective you cant get safely any other way. Were below the clouds, right near the sea level. And shooting back at the shore. Reporter the drones buzzing above this cliff arent just taking dramatic pictures. Theyre gathering data to help create a 3d map of the eroding california coastline. What have you seen along the coastline so far . Ive seen a lot of destruction. Reporter this week george flew his drone in a grid above endangered buildings in building now teeting ingteetering on the edge. The high tides are going and hopefully in the future well be able to predict things like what happened here at the apartment complex. Reporter its a big job. Theres 1270 miles of shoreline along california. And scientists have identified several thousand homes that may be in jeopardy during this el nino winter. The work you do here today might make it safer for people to live here tomorrow. Hopefully. Thats the point. Reporter it could eventually help those who never intended to live on the edge. Carter evans, cbs news, pacifica. All three inmates who escaped a Southern California jail are back behind bars. The last two fugitives who face charges including murder and torture returned to jail overnight. They were captured in San Francisco yesterday. A third inmate surrendered friday. This time the men are being kept in separate cells. Still ahead, accusations of racial intolerance at an elite and an extremely rare albatross sighting. Cbs overnight news will be right back. 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A Boston High School known for being at the center of diversity and progressive politics is now at the center of began a social Media Campaign alleging racial incidents on campus campus. Kenneth craig reports. We want to blow up every single social media. Reporter when meggie noel and kylie webstercazeau made this Youtube Video. The students claim underlying racial tensions in the hallways and online ramped up when Ferguson Police officer Darren Wilson was not indicted in the shooting death of michael brown. It made students of color really uncomfortable that students who they sit next to in class every single day, who they see in the hallway, whose locker is next to them said these things and thought these things. Reporter among their claims they Say School Officials did not reprimand students who openly used racial slurs at school. Using the blackatbls, theyre now encouraging other students to join the conversation. And the discussion is expanding. Boston mayor marty walsh is supporting them. The experiences that our kids have in our schools shouldnt be racism. Reporter the district is now investigating. Boston latin is the Oldest Public School in the country, considered a top Feeder School for the ivy league with a long list of prestigious graduates. 22 years ago, roughly 23 of the student body was black. Today africanamerican students make up less than 9 . Whatever happens, were definitely going to be holding the Administration Accountable to make sure these things dont persist in the future. Reporter the schools head master has laid out a sixpoint plan to address the issue. Jeff, the conversation has taken off with students also joining the discussion from other boston schools. Kenneth craig, thank you very much. Up next here, what soda flat sales. Soda sales have fizzled about 14 in the past decade but Cola Companies are making moves to turn things around with pepsi opening its first restaurant this week. With jill schlesinger, in part, theyre selling this by selling smaller cans . Yes. Its working. Consider it portion control. A lot of americans are trying to cut down on their sugar and theyre actually willing to pay more for a smaller size. Cocacola says in the first nine months of last year, small can sales were up by 15 since 2011 large sales are down by 5 . So, theyre actually stemming the tide of sliding sales with these smaller containers. Marketing is always such a massive part of this. And its a retro campaign. Called taste the feeling. Its aimed at both millenials and boomers. We dont know whether its going to work, but theyre throwing a lot of money at it. Pepsi going old school. Theyre sponsoring the super bowl halftime show again. This seems to work. The combination of the nfl and pepsi. Stores say they actually drive traffic. Pepsis marketing machine will drive traffic into the stores. Pepsis happy because they sell more product. Theyre also trying these new ideas like this restaurant. Yeah, lets talk about this, this pepsi restaurant. Its not called the pepsi restaurant. Its called the kola, with a k, the kola house and everything is featured around the kola nut, the basis for these sodas. When you look at the ingredients, it goes far afield. You can get vodka infused with bitters. You can get your meat drillsed with truffle oil. Its a far cry from pepsi, chips and dips, but maybe it will work. Jill, thanks very much. A golf stroke for the ages today. Golfer with a holeinone on a par 4. It is the first time that has happened in the history of the lpga. 3 under par is anal ba tros or a double eagle. She was pretty excited about, it as you can see. Still ahead, extremely tough sledding, even for these athletes. Chest pain, like theres a ton of weight on your chest. Severe shortness of breath. Unexplained nausea. Cold sweats. Theres an unusual tiredness and fatigue. Theres unfamiliar dizziness or lightheadedness. Unusual pain in your back, neck, jaw, one or both arms, even your upper stomach, are signs youre having a heart attack. Dont make excuses. Make the call to 911 immediately. Learn more at womenshealth. Gov heartattack. When the twins were about 10 days old, the doctors told us they were going to need blood transfusions. Were so proud of who theyve become. An hour of their life giving blood is just immeasurable, how powerful that one donation could possibly be. We close tonight in the frozen north with a shred dog race. Its not as long as the iditarod but just as cold and those up for a challenge, just as invigorating. Reporter with the roaring cheer and a rousing song go reporter a 32yearold tradition is under way. The bear breeze is a gruelling 383mile sled dog marathon. Extreme, rugged terrain in the dead of a north minnesota winter. You have to be tough. Dogs. Reporter preparing for the race means months of vigorous training. Good girl reporter and no