Memo that shed some light on the Campaign Thinking going forward. Foremost is the belief that marco rubio cannot defeat donald trump. That rubio has yet to win any state, anywhere, and that ted cruz has more money in the bank, scott, to continue to fight. Dean reynolds. Covering the campaign in las vegas. Dean, thank you very much. Polling shows that Hillary Clinton is leading bernie sanders, nearly 2 1 in next carolina sheech won nevada over putting her back on track after her drubbing in New Hampshire. Heres nancy cordes. Yes, that is former president , clinton, bouncing for joy with Campaign Staffers in nevada. After his wife stormed the vegas strip for two days. And then won the states most populous county by ten points. Do you think secretary clinton the end . No, i dont. Matter of fact. We had three rallies the night before. No, i am proud of what we did. Still the loss is a blow for sanders who is tied with clinton in the delegate count until you factor in superdelegates. Top Party Officials who are fre to back either candidate. That gap will grow. If clinton prevails as expected in South Carolina. In texas this weekend. She accused sanders of misleading vote ears but his plans. I dont think it right to look a person in the eye who is hurting and need help and tell them that if they vote for you you will get 5,000 in health care but only have to pay 500 for it. Sanders stand by his math. Thats not misleading thats the fact. You know there are liberal economists who say. Check out who the liberal find out who fund them. Reporter economists four former Top White House advisers who sent an open letter to sanders arguing that his quote extreme claims about the benefits of his proposals could undermine the progressive economic agenda. None of them are paid by the clinton campaign. Though a couple did work for former president , bill clinton. Sanders told us, they di crunching the delegate numbers for us is john dickerson, 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. Agreed to a partial ceasefire 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 and make the streets again. But furious isis managed to smuggle three bombs 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 no way, abu mahran tells me. Everybody in the crowd agrees. We dont want a ceasefire until all the terrorists are out of our country. 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 a tribute. 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 understands why this senate must do what he said it must do in 1992. Now in the past it has taken 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 the authorities. If one of the buses had been 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 comply. Scott that happens before theyre loaded with passengers and backage. Don dahler, thank you very much. Breast cancer rates remain the same so why is there a big increase in the mastectomies. Dream. Right back. Like country crocks made with real simple ingredients. And no artificial flavors or preservatives. Real Country Fresh taste from real ingredients. Welcome to crock country. Lets get these dayquil liquid gels and go. But these liquid gels are new. Mucinex fastmax. Its the same difference. And fights mucus. Mucinex fastmax. Flu liquid gel and fights mucus. Lets end this. Happy anniversary dinner, darlin can this much love be cleaned by a little bit of dawn ultra . Oh yeah. One bottle has the grease cleaning power of two bottles of this bargain brand. A drop of dawn and grease is gone. Sometimes we use ky ultragel to enhance my bodys natural moisture so i can get into it a bit quicker. And when i know shes into it, i get into it and. Feel the difference with ky ultragel. Someones hacked all our technology. Technology. Say, have you seen all the Amazing Technology in geicos mobile app . Mobile app . Look. Electronic id cards, emergency roadside service, i can even submit a claim. Wow. Yep, geicos mobile app works like a charm. And a whole lot more. Choose to move freely. Move free ultra has tripleaction support for your joints, cartilage and bones in one tiny pill. Move free ultra. Get your move on. And now try move free night. The first and only 2in1 today, senator Claire 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 noticed the trend over the last several years. The jump in the mastectomy rate is fueled by several things including greater awareness 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 biopsies and worries. Scott more of what we are seeing these days. Specialized personalized medicine giving women more choices in treatment decisions. Dr. Jon lapook. Thank you very much. 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, the Labrador Retriever is on top, followed by the german 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 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 how are you . Im fine. 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 . Did you ever think there would be a black president . I did not. Reporter you did not. 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. From the Broadcast Center in new york city. Announcer this is the cbs overnight news. Hi, welcome to the overnight news. Im demarco morgan. The next round in the battle for the gop president ial nomination takes place tonight in nevada while will hold caucuses. Republican party caucuses. Donald trump is seeking to submit his frontrunner status in the state where he has casinos employ thousand. The latest numbers show trump with a commanding lead over rivals. Dean reynolds reports. Reporter history appears to be on Donald Trumps side in this race. Republican candidate has won both the New Hampshire primary and the South Carolina primary and then gone on to lose the nominaton. 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. One way or the other. I said never looked at it. Somebody said he is not. I retweeted it. I have, 14 Million People 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. Nancy cordes reports. The victory was a huge relief it preserves 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 while Younger Voters once again were heavily for sanders. Feel the bern reporter both candidates 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 weekend. Elizabeth palmer is there. Reporter standing a few yard 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 but the devil always in the details. When would it start . Who would participate . Who would monitor it . In northern s