Side with him, crunching the delegate numbers is john dicker sorch, cbs news, political director and anchor of face the nation. John, huge primary nights on march 1 and march 15th. Can any one catch trump . Marco rubios strategy is that he is trying to claim he is the one mainstream alternative to donald trump. But he still hasnt won a contest. His best shot for a decisive win when the more moderate electorates in ohio and florida vote. Before that rubio has to beat back a challenge, john kasich, from the mainstream title and do well enough to survive on super tuesday, march 1, when 11 states vote. Many which have electorates that favor donald trump and cruz. Trump may have momentum off march 1 then. Thats right. Ted cruz though hopes all of his chips are kind of riding on march 1 as well. Super tuesday. Thats when his home state of texas votes. Other states. Alabama, arkansas, oklahoma, tennessee. Which have a large share of strong conservatives and evangelical voters groups heap does well with. That strategy took a blow saturday in South Carolina because it has an electorate with the same makeup and where cruz went headtohead with donald trump and still lost by 11 points. John dickerson. Anchor of face the nation. Thank you for the insight. Today the u. S. And russia in syria to start saturday. But it wont stop the fighting. Two important forces, isis and the al qaeda affiliate called al nusra were not included in the agreement because theyre terrorist groups. And about a third of syria is held by isis. Yesterday, isis claimed responsibility for bombs that killed at least 100 in suburban damascus and our Elizabeth Palmer is there. All day, the men of sayeeda zainab carried victims to the graves. On the face of women. Shock and grief. The friends are mourning 22yearold fatima. Our heart are broken, they say. What did she do to deserve to die . But there was anger and frustration too. At the bomb site, local residents pitched tine clean of but furious isis managed to smuggle three bmz intoombs into their community. Standing a couple yard from where the biggest bomb went off. A car bomb. In the afternoon. As kids were getting home from school. And the scope of the damage, the fronts of the buildings have been blown clear off. And everybody who lived inside. And merchants ran the shop from the ground floor theyre all dead. This video shows the the frantic moments right after one of the explosions. Survivors rushing to help the wounded. You might think people who witnessed carnage and today burying more than 100 family members and friend would welcome a pause in the violence. Not so. Are you optimistic there will be some kind of truce . No way, abu mahran tells me. Everybody in the crowd agrees. We dont want a ceasefire until all the terrorists are out of it is not a good sign for this proposed truce when even the citizens arent on side. And the people we spoke to today, scott, are very skeptical about this pro posed ceasefire. They say, in a war this complex and savage. There is just no way to coordinate all of the factions laying done their arms. Liz palmer with a rare report from inside syria. Liz, thank you. Well today the u. S. Supreme court met for the first time in 30 years without justice antonin scalia. His empty seat today was a reminder of the political battle over how to fill it. And here is our chief legal correspondent, jan crawford. Reporter Justice Scalias seat on the bench now is draped with a black cloth. As the the justices return to work the first time any of the eight have served on the Court Without the larger than life scalia. Chief Justice John Roberts started the morning session with we remember his incisive intellect, agile wit and captivating prose. We cannot forget his irrepressible spirit. The 79yearold scalia was laid to rest saturday. After a funeral mass led by his son paul. A catholic priest. Now, the fight over his successor begins in earnest. The president is reviewing files of possible nominees, while Republican Leaders are vowing to block any one the president sends up. Democrats accused republicans of being obstructionist. But when democrats control the senate, and republican george w. H. Bush was in the white house, then the Judiciary Committee chairman, joe biden proposed the same thing republicans are doing now. Once the political season is under way. And it is. Action on a Supreme Court nomination must be put off until after the Election Campaign is over. Current committee chairman, chuck grassley, a republican, agreed. In his heart of hearts, he do what he said it must do in 1992. Now in the past it has taken a month for a nomination. Scott, the president is likely to move more quickly than that. Jan crawford at the court for us tonight. Jan, thank you. Fares as low as 1 have drawn millions of passengers to megabus. Yesterday one of its buses burnedout side chicago. Everyone got out safely. But this has happened before. And we asked don dahler to take a look. Sun days fire began with a blown tire. And flames engulfed the bus. Very horrifying. Everybody running down the highway. It was terrible. Reporter this wasnt the new Jersey Based Company first brush with tire related disasters. In 2012, a 25yearold graduate student in illinois was killed in this crash. Allegedly caused by a blown tire. 47 passengers were hospitalized. There have been at least five tires on mega buses. Including this one in 2014 that caused the bus to slam into a guardrail on i95. At least one lawsuit has been filed claiming a problem with the buses carrying too much weight. Clarence didlow with center for auto safety. How does weight affect tires and tire safety . If a bus is overweight, worst case scenario, the tires can rub against the wheel well which generates friction, heat, ultimate low a fire. In the last 24 months, safety inspectors found 29 maintenance kidded a hazard to drivers or passengers. Mega bus carries 10 Million People a year in its fleet of 275 busz release aid statement saying safety continues to beep our top priority. And mega bus is cooperating with federal a yaens that didlow says that is not enough. If one of the buses had been pull off the road. It might be a catastrophic fire before the people could get out of the bus to safety. Ditlow says the buses are weighed to make sure they scott that happens before theyre loaded with passengers and backage. Much. Breast cancer rates remain the same so why is there a big increase in the mastectomies. And a sent their dances with dream. The cbs overnight news will be right back. Even keep your toilet clean and fresh. Introducing lysol click gel. 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And now try move free night. The first and only 2in1 today, senator Claire M Mccaskill of missouri says she has Breast Cancer and will stay in st. Louis for three weeks for treatment. A democrat. 62, serving her second term. We were struck by this report today from the u. S. Department of health. It said that mastectomies have increased by 36 over a decade. Though the rate of cancer, Breast Cancer has stayed the same. Dr. Jon lapook is looking into this. What is going on . Cancer doctors noticinged the trend over the last several years. The jump in the mastectomy rate is fueled by several things generated by celebrities Angelina Jolie and rita wilson who have gone public with the decision to have preventative mastectomy. Breast surgery has gotten better over the years and cosmetic result is usually excellent. In addition we emphasize genetic risk and family history. With that information, many women just want to loper their risk as much as possible. And finally, many women want to be done with all of the screening which carries the risk of false positives, unnecessary by on tee biopsies and worries. Scott more of what we are seeing these days. Specialized personalized medicine giving women more choices in treatment decisions. Well be right back. Today the cdc said it underestimated the cancer risk from some laminate flooring sold by lumber liquidators. Turns out the risk is more than three times greater than the agency reported two weeks ago. Concerns were first raised by a 60 minutes investigation. The American Kennel Club is out with its annual list of the most popular dog breeds. And for the 25th straight year, top, followed by the german shepherd, golden retriever, the bulldog and the beagle. But most popular of all of course is the mutt. Accounting for more than half the canines in america. Up next, the day virginia see. Tt0w tx hi 4 tt0w tx hi el l tt0w tx hi ed tt0w tx hi 8hfzt tt0w tx hi kzh[5 tt0w tx hi nh. \ tt0w tx hi 0ph0;< tt0w tx hi sh i\ tt0w tx hi ueh , tt0w tx hi 7hh . x virginia mclaurin turns 107 next month. She wanted more than anything to meet the president. So she wrote to him. Even offered to go to his house if it would make it easier. Heres chip reid. Virginia mclaurin. Hey hi im fine. Oh its so nice to see you. If thes an honor. You want to say hi to michelle . Hold on now. Slow down now, dont go too quick. Shes 106. Reporter yes she is 106 and in the video released by the white house, virginia was so excited to meet the president and first lady she started dancing. And so did they. Whats the secret to still dancing at 106 . For one thing she still volunteers 40 hours a week at a nearby school as a foster grandparents. Today we found her sitting in the sun outside her apartment in washington, d. C. When you first saw him, you just shouted . I sure did. Shouted for joy. For joy. I felt that all in my soul. It was the greatest time of my life. Reporter and what a life its been. Watching as the world changed around her. We have come a long way, you know that . Would be a black president . I did not. Reporter you did not. I did not think it would ever be a black president. Now she has met one. A black president. Look at him. Right there. A black wife. Thats me. What was the best part of meeting the president and the first lady . That i felt like i made it. I made it. Reporter you made it . I made it. And i feel like i could die happy. Reporter and with this dance, she made millions of others happy too. Chip reid, cbs news, washington. And thats the overnight news for this tuesday. For some of you, the news continues. For others, check back with us a little bit later for the morning news and cbs this morning. Im scott pelley. Announcer this is the cbs overnight news. Hi, welcome to the overnight news. Im demarco more gachblt the next round in the battle for the gop president ial nomination takes place tonight in nevada while will hold caucuses. Donald trump is seeking to submit his frontrunner status in the state where he has casinos employ thousand. Numbers show trump with a commanding lead over rivals. Dean reynolds reports. Reporter history appears to be on Donald Trumps side in because, in recent years, no republican candidate has won both the New Hampshire primary and the South Carolina primary and then gone on to lose the nomination. I love to win. Dont we love to win . I love it. Reporter in georgia sunday, trump sounded carried away by his big win in neighboring South Carolina hours earlier. I tell you what, we are going one after another. Are we going to win georgia . Yes. [ cheers and applause ] reporter even a temporary blackout was not enough to dim his enthusiasm. Dont turn the lights on. Plus we save on electricity, right . Having raised question as but ted cruzs right to run for president , trump turned a similar argument against marco rubio sharing a tweet that questioned the florida senators eligibility. Though trump said he wasnt sure one way or the other. I said never looked at it. Somebody said he is not. I retweeted it. Between twitter and facebook and instagram. I retweet things weeft start dialogue. Very interesting. He says something edgy, outrageous. The media flocks, covers that. Nobody can get any coverage on anything else. Reporter second place finisheren South Carolina. Rubio are gaud there is more than one way to look at trumps win. Of the people left in the race, no one can unite this movement or this party faster than i can. Reporter with the republican field shrinking he sees an advantage. You have 70 of the republican electorate not voting for him. Cruz, close third saturday saw his own advantage. We are seeing people come behind our campaign and we are the only campaign that has beaten donald trump and that can beat donald trump. For the democrats the road to the nomination wind through South Carolina. Which will hold its democratic primary saturday. Hillary clinton hold a big lead there over bernie sanders. Sanders has been closing the gap. The victory was a huge relief for the clinton camp. Frontrunner status. The campaigns did not have much time to dwell. 13 contests in ten days. Starting here in South Carolina. Shrug off his nevada loss, sanders told a crowd of thousands he is on a roll. If you look at national polls. You want a candidate who will defeat donald trump. You are looking at that candidate. Reporter tell that to clinton who blitzed the vegas strip in 48 hours to beat back a late sanders surge. Some may have doubted us, but we never doubted each other. Older voters, women and africanamericans, were all key to clintons victory. While Younger Voters once again were heavily for sanders. Feel the bern trying to prove they have appeal with minority voters. Our support in the Latino Community has gone way, way, up. I believe we actually won the latino vote in nevada. I think you are seeing our support in the Africanamerican Community going way up as well. Reporter sanders is winning the money race according to january fundraising totals. He outraised clinton last month by nearly 7 million. And outspent her as well. Which could explain why she is in california fundraising. As expected the United States and russia agreed to a ceasefire in the syrian civil war. The details are vague. Most hostilities are supposed to end saturday. The fiveyear long conflict left 250,000 dead and driven millions from their homes. One problem the ceasefire doesinclude Islamic State which launched deadly attacks in the heart of damascus over the weekend. Litz beth Elizabeth Palmer is there. From where one of the massive car bombs went off. The devastation is just epic. The fronts of all the buildings have been blown clean off. And the people who lived in the apartments, shop keepers had businesses on the ground floor theyre all dead. Isis was never going to be party to any ceasefire. But this proves their commitment to total war. The other players in this war, conflict. Do say theyre ready for some kind of truce. President assad said he was ready for it over the weekend. And the opposition says, theyre going to try too. But the devil always in the details. When would it start . Who would participate . Who would monitor it . In northern syria, the syrian army, back by planes are conducting an offensive around aleppo. At the moment theyre winning. That may be a reason behind the scenes. That the Assad Government is dragging heels on troops. Trying to put the brakes on the hover board craze. The Consumer ProductSafety Commission says most boards arent safe and, those that dont meet safety standard will be seized for recalled. Amazon is offering refund to customers who purchased hover boards through its site. Vladamir dittier reports. Hover board featured in the nba slam dunk contest. And phil on modern family got one as a present last week. But this holiday seasons hot toy is linked to dozens of fires in 24 states since december resulting in millions in property damage. This home in nashville was destroyed by fire last month. And this familys Christmas Celebration was ruined. Sipt here on the floor. And it just blew up. Sparks and fire came from the toy. Newly updated voluntary safety standard to manufacturers, it says board that do not comply pose an unreasonable risk of fire to consumers who risk serious injury or death, if their hover boards ignite and burn. This is really a shot across the bow from the Consumer ProductSafety Commission, saying that if you are bringing a product in, not meeting these standard, we will kid them defective. The fire aper to stem from excess heat. Generated by the boards lithium batteries. You can clearly look at this device, see that the fire started inside the device. One of the manufacturers. Cpsc is actively investigating one of the biggest. Swagway, hit with a class action come planltplaint in december. Mashable says it received a statement saturday. In complying with the cpsc requirements we ask customers who purchase a swagway to retrain from using their board in the interim. Recalls are inif iteinevitable. There was a miscommunication it said it is not asking customers to stop using hover boards and products always met International Safety