David duke, okay . I dont know anything about what youre even talking about with White Supremacy or White Supremacists. Reporter donald trump demured about david duke. I have to hook at the group. I dont know what group youre talking about. You wouldnt want me to condemn i group i know nothing about. Reporter but trumps remarks today are 180 degrees from his stance friday when he was asked about dukes endorsement. I didnt even know he endorsed me. Okay, i disavow, okay . Reporter his rivals pounced. Kasich says trump has explaining to do. Donald trump refused to disassociate himself and condemn White Supremacists, and thats horrific. We dont have anyplace for White Supremacists in the United States of america. Reporter ted cruz took to white extremists are wrong. We cannot be a party that nominates someone who refuses to condemn White Supremacists and the cue cluck clan. We cannot be a party that does that. Reporter trump appears increasingly disenchanted with that party and said hes prepared to run as a Third Party Candidate if necessary. The Republican Party is not treating me right. And theyre not treating the people that i represent right. Reporter and theres some evidence to support trumps claim. A new cbs news battleground poll found that more than half of republicans in three super tuesday states, georgia, texas, and virginia, say the Republican Party does not represent them well. That poll also showed that voters in those states believe trump offers the most optimistic message of any republican still in the race. In alabama tonight, trump picked up the endorsement of jeff sessions, the states junior senator and longtime adviser to trump on immigration policy. Major garrett, thank you very much. Hillary clinton expanded her primary victory in South Carolina last night. Julianna goldman has more on how clinton won and what it means for sanders. Reporter Hillary Clinton stormed into arkansas and tennessee on sunday, setting her sites on the handful of Southern States that vote on super tuesday. And trying to capitalize on her momentum with black voters, who propelled her landslide victory in South Carolina. Nearly 90 of africanamerican voters backed clinton yesterday, breaking the record set by then senator obama in 2008. That spells trouble for Bernie Sanders who had hoped to stall clintons momentum heading into states where the democratic primary electorate is more diverse. We did really, really badly with older africanamerican voters, i mean, we got decimated. Reporter he has wracked up delegates in iowa and New Hampshire, largely with the so sanders is visiting states where demographics play to his favor, like okay oaklahoma. Im going to need your help to win the democratic nomination. [cheers and applause] and im going to need, im going to need your help to win the general election. [cheers and applause] had. Reporter clinton, meanwhile, is turning her focus away from sass ders and pivoting to her next target, republican front runner donald trump, even if like earlier today in a Memphis Church shes not mentioning his name. I said last night, america has never stopped being great. Our task is to make america whole. [ applause ] reporter behind the scenes, clinton allies and the Democratic National committee are also working through various but not all establishment democrats are coalescing behind clinton. Chelsea gaborik stepped down as her position as vice chair of the dnc to endorse sanders. More than 1500 delegates in all are up for grabs on super tuesday in these dozen states, and were joined by director of elections. It was just a month ago hillary barely won in iowa. She was soundly defeated in New Hampshire. What has changed . The ground has shifted to very friendly territory for her. These states have high concentrations of africanamerican voters. They make up the majority of voters in most of these Southern States, and they are solidly behind her. That said, you are still seeing some issues. Yeah, she still trail thes bherny on the republican side, there was so much talk about marco rubio after this debate and talk about the establishment trying to get behind one candidate. Voters dont seem to be listening to that message. When voters hear the word establishment, they hear it as a bad word. They are less likely to vote for any candidate too tied to the establishment. But theyre not just siding with trump because hes antiestablishment, they think he can win the general. They think hes in the best position to win in the general. A young Police Officer is being remembered tonight. She was killed this weekend during her first day on the job. Following an awful series of events in northern virginia. Jamie yew cass has details. Posted of Ashley Guindon about to start her first shift, the caption, be safe. She was literally sworn in the day before on friday. Reporter before becoming a u. S. Marine reservist, she interned with the Police Department. She clearly had a way to serve others that went beyond herself. Reporter go win donewenuindon and others responded to a Domestic Violence call. We have three officers that have been shot. Reporter guindons Training Officer and eight year veteran jesse hempen were wounded and are expected to survive. Officers provided first aid to the wounded officers until fire and rescue staff could get on scene. Later in the afternoon, officer reporter the shooter surrendered and police found his wife dead in the home. Hess son was unharmed. He is a Staff Sergeant who works at the pentagon. No one knows why he fired. Neighbors described him as a gentle giant. The guy was a good guy. Great neighbors, you know, just something must have snapped many. Reporter ery sunday morning, more than 100 patrol cars lined up outside the hospital where officer guindon was taken. They provided escort to a young woman whose first day on the job tragically became her last. Hamilton is expected to be in court tomorrow. He faces one count of capital murder of a Police Officer and is being held without bond. He the county attorney will seek the death penalty. In utah, anger over a Police Shooting last night sparked protest that closed part of reporter violence exploded late saturday night after a salt leak city Police Officer shot a 17yearold black teenager in the chest and stomach. His friend saw the shooting. When the cops came, they ran up to him, pulled their guns out and told him to stop. And as he was turning around, they shot him. I know i seen them shoot his chest and stomach. Reporter Police Responded to a call to break up a fight outside this homeless shelter. Police say they opened fire after mohammed refused to drop the weapon. Kutvs Jeremy Harris was one of the first reporters on the scene. Witnesses were very worked up. They were very angry. You could tell there was a lot of passion. So many people saw this. At any given time, there are at least 50 if not 100 or more people standing outside the homeless shelter. Reporter as the crowds grew angry, protesters launched rocks and bottles at about 100 police. About race. Several people walked by, chanting black lives matter. Reporter the officers wear body cameras and will release the video of the shooting as soon as possible. Meantime, mohammed is in Critical Condition and two officers are on routine, paid, straightive lead. In hesston, requests kansas, more details are emerging. Reporter adam miller came facetoface with the shooter. I saw him come around the corner, and he just looked kind of confused. So i told him he needs to run, theres a fire. And he just looked confused. So i told him again, and he said i know, and he shot me. Reporter cedrick ford shot 17 people thursday, including 14 coworkers oot excel industries killing three of them before police shot and killed him. Investigators believe he acted served with a protective order taken out by an exgirlfriend. Across hesston today, it was a time to come together at sunday services to honor the victims, and at a town hall meeting where Sergeant Chris carter, one of the first on the scene was embraced by the community. The people that worked at that place were phenomenal. Their actions were heroic that day. Reporter hesston strong has become a motto here. Theyre all going through a really tough time. The least i could do is come out and help. Reporter for many, healing also means forgiveness and compassion, even for the killer. I dont know what he was going through, but obviously, he felt this was the way out, and so my heart just aches for him. Reporter there will be a Memorial Service tonight at hesston high school. Next week, his exgirlfriend is expected to face a judge for knowingly giving him weapons syria remains relatively calm tonight, two days into a partial ceasefire, but as Elizabeth Palmer reports from homs, the quiet has brought little comfort. Reporter three years a the old city of homs was the fiercest line in the war in syria. But then it fell to the government and the war moved on, leaving a wasteland and hundreds of thousands of homeless people. In some parts, residents are trickling back, reestablishing the essentials of life, commerce, even school. This is day two of the partial ceasefire, and people are holding their breath, hoping it will hold. Right on the edge of town, we can hear the sounds of fighting, though. But with no monitors anywhere, its impossible to say who is attacking whom. Reveal what a fine thing peace is. The lasting peace necessary to rebuild in a place like this still feels a long way off. Elizabeth palmer, homs. In iraq, dozens were killed and about 100 hurt in two bomb attacks. The first went off in an outdoor market in baghdad. Minutes later a suicide bomber blew himself up. A group affiliated with isis claimed responsibility. A series of gas explosions in a russian coal mine have killed at least three dozen. It happened in northern russia above the arctic circle. 81 miners were rescued after the original blast, but those still trapped are presumed dead. Coming up, we follow the email trail in flints water back. Enough pressure in here for ya . Im gonna take mucinex sinusmax. Too late, were about to take off. These dissolve fast. Theyre new liquid gels. And youre coming with me. You realize i have gold status . Mucinex sinusmax liquid gels. Dissolves fast to unleash max strength medicine. Lets end this. Uh, hello geico . Yeah, i was just talking about your emergency Roadside Service and how its available 24 7 and then our car overheated. What are the chances . 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Goifrn snyder declared the river water unsafe to drink, a deputy tried to discourage a switch back to the old watersource. Treasury deputy told the governors aide, gentlemen, in the attached is a description of what it would cost to reconnect to detroitprovided water, i assume hope no one is seriously considering that option. The estimated cost was 12 million a year. The city eventually did reconnect to detroit water in october of 2015. Days after the governor declared flints river water unsafe. The announcement was triggered by an independent study that linked lead poisoning in children to the water. One thing we keep hearing is that the governor is not involved or is detached. This would be good to show that hes there and cares. If we dont announce until hes and still get the optics. Had but protests have continued. The fallout was eerily predicted in an email sent more than a year ago when the governors special pro jebs manager wrote, this is a Public Relations crisis waiting to explode nationally. Friday, the governor admitted that he should have been more directly involved back when his aides first emailed about the problem. Thats where im kicking myself every day. I wish i would have asked more questions. I wish i wouldnt have accepted answers. Im not going to have that happen again. Reporter snyder says hes working to expand Health Care Coverage for Flint Residents and subsidize their water bills. Adrianna diaz, cbs news, chicago. Fivehour tantrum. Caribbeans anthem of the seas to return early. It is based in new jersey. A frightening scene at a hen due festival hindu festival in india. An elephant went on a rampage and started picking up trucks and flinging them around. No one was hurt, including the man on the back of the elephant. Some on the baseball field will no longer get their just they have banned smashing pies in faces. Dangerous. Still ahead, the gymnast who finally, tonight, talk about gymnastics floor routines and many picture Something Like ballet set to music. But we introduce you to a gymnast stretching the limits to a different beat. Reporter gymnastics is all about grace. Nice. Reporter power. And hiphop . Its not just the high notes dejesus hits, its those moves. This is a very traditional sport, and what you did is very nontraditional. Not traditional at all. Reporter she and her teammates are transforming the image of the sport, says the coach. I feel that its much more about entertainment now than about the ridge id sport as perfection. Reporter sophina is getting high marks from judges. But even higher marks on social media, where her floor exercise earlier this month, the first time she ever performed it, went viral. I woke up, and my mom called my, and she was like, oh, honey, did you know that you have like 5 million views on your floor routine . I didnt even know it was posted anywhere. Reporter its now been viewed more than 40 million times. Tell me about some of the responses youve gotten. Some of the more interesting ones have been marriage reporter some celebrities have taken notice. Reese witherspoon. I found out chris brown posted it on his facebook, and i was like, oh, my gosh, no way, no way. Reporter even her teammates have gotten into the groove, along with her coach who admits you can please the crowd but still not please everyone. I think there are judges that still dont like it. Ive always compared it to a picasso. A picassos worth 30 million, but there are a lot of people who wouldnt put one in their home because they dont like it. But that doesnt mean that it isnt excellent art. Reporter sophina has danced professionally. But you will not find it in her routine. You will not find the nae nae or the whip in her routine. The one performance i did, that was like my olympics. Reporter and a home as good as gold. That is the overnight news for this monday. For some of you, the news continues. For others, check back later for the morning news and cbs this morning. From the broadcast center, im jeff glor. This is the cbs overnight news. Welcome to the overnight news. Im jeff glor. The biggest day in the president ial primary season comes tomorrow. Super tuesday. 12 states involved. Democrat Bernie Sanders is promising a come back after his big loss to Hillary Clinton in South Carolinas primary. Clinton came away with 73 of super tuesday could bring donald trump closer to the nomination. In virginia, our Battleground Tracker shows trump with 40 of the support of voters, compared with 27 for marco rubio. In georgia, trum is at 40 . But in his home state of texas, cruz is out front with 422 . Cruz discussed the race with john deckickerson on face the nation. I think tuesday is the most important day of this primary election. The most delegates will be awarded in wumone night on super tuesday. 65 of republicans believe donald trump is not the best candidate to go head to head with Hillary Clinton, and we are the only campaign that has beaten donald trump, and were if you look at the super tuesday states, we are running neck in neck with donald across sumper tuesday. If we come together, if conservatives stand together, were going to have a grate night great night on tuesday. If they dont, is he unstoppable . There ins no doubt that if donald trump steams through super tuesday, it may happen. But if you are at home and you dont want donald trump to be the republican nominee, then the only candidate who can beat donald is our campaign. So even if you like another candidate, stand with us, if you dont want donald to be the nominee. Because if and when we stop helm on super tuesday, thats how we end up beating donald and nominating a proven conservative, which is what its what did you make of Chris Christie endorsing donald trump . I dont think that was a big surprise. I think it