Pelley this evening billionaire and former new york city mayor Michael Bloomberg announced he will not be an independent candidate for president. He had spent the last many weeks researching a run, but now he says a threeway race would likely lead to the election of donald trump or ted cruz, which bloomberg said was a risk he could not take. Major garrett is covering the g. O. P. Race for us. Major . Reporter scott, bloomberg acknowledged he could not win. In a column on his companys web site wrote, i love our country too much to play a role in electing a candidate what would weaken our unity and darken our future. Trump and cruz for their part eyed a oneonone battle for the g. O. P. Nomination. I would love to take on ted one on one. That would be so much fun. Reporter donald trump is trying to make it a twoman race for the republican nomination by finishing off florida senator marco rubio when his home state votes next week. Rubio has been a total noshow in the u. S. Senate. Today, trump portrays rubio as desperate and unfit for office. People are starting to learn that donald trump the character and donald trump the person are not the same thing. Reporter the latest poll in florida shows trump with an eightpoint lead over rubio with ted cruz and john kasich well behind. Cruz contends the trump bubble is beginning to burst. You want to beat him, you have to beat him at the ballot box. Our campaign is the only campaign that has demonstrated we can do so over and over. Reporter cruz is working to line up several Republican Senate endorsements this week, an ironic twist for a candidate thats also run an antiestablishment campaign. Donald trump is someone who has been in his own words part of the establishment his whole life. Reporter outside groups are also lining up against trump, unveiling a slew of new negative commercials. I have the best words. Reporter the ads attack trump for using vulgarities. Im going to sue his [bleeped]. I dont give a [bleeped]. Reporter his depiction of trump would not have survived the p. O. W. Experience. Reporter and on past liberal positions. Which candidate supports obamacare and the wall street bailout . Its donald trump. Reporter today trump warned thousands of supporters in North Carolina its only just begun. You see the money they spent . Do you see the millions in negative ads about me that are mostly phony ads. Reporter the latest poll in michigan which votes tomorrow shows trump with a 14point lead on cruz. Scott, trump wants a big win there to bolster his claim. That a pop list message can help the g. O. P. Win in a general election. Pelley major, thanks. There are 150 republican delegates at stake in four states tomorrow. Our latest cbs news count shows trump has an 80delegate lead over ted cruz. On the democratic side, Hillary Clinton leads Bernie Sanders by 639 delegates. Nancy cordes is covering that race. So we have to be well positioned. Reporter you can tell how badly these two want to win exaggerations. He was against the auto bailout. Reporter last nights debate and in radio ads today, clinton accused sanders of opposing the 2009 aid package for michigans carmakers. Vote for the one candidate who stood up for the auto industry. Reporter sanders supported the bailout fund, but he balked when they were attached to a larger bill that sent billions to wall street. Secretary clinton went out of her way to mischaracterize my history. Reporter but hes doing some mischaracterizing of his own. He blamed detroits woes on what he calls Hillary Clintons free trade policy. Nafta, supported by the secretary, cost us 800,000 jobs nationwide. Reporter not true, says factcheck. Org. Nearly all economic studies say negligible. Sanders got some unexpected praise today from the National Rifle association, which tweeted its appreciation after he argued it is not fair to hold gunmakers liable for gun deaths. But youre really talking about people saying, lets end gun manufacturing in america. Reporter both candidates have spent days in this state, and heres why sanders needs an upset here the prove that he still has a shot nationally, while clinton is just as eager to show he has no path. Our latest battleground tracker, scott, shows shes leading here by 1 1 points. Pelley nancy, thank you. Today a bomb exploded at an airport checkpoint in somalia. But its what the bomb was in heres jeff pegues. Reporter the bomb was hid anyone a laptop computer and shaltered windows at the small Airport North of the somali capital mogadishu. Somali investigators say two diffused, including one in a printer. In february, a laptop bomb smuggled through Airport Security in mogadishu blew a hole in this jetliner shortly after takeoff. One man was stuck out of the plane and killed. The terrorist Group Alshabaab is suspected in both explosions. But the devices have the hallmarks of al qaeda in the arabian peninsula. In 2010, aqap tried and failed to use bombs embedded in printer cartridges to blow up cargo planes. Counterterrorism analyst Muhammad Fraser rahim. Terrorist organizations Work Together for mutual purposes. If they have one limited capability on one end, they Work Together on another end so they can build their forces together. Reporter u. S. Intelligence officials point to octobers downing of a Russian Airliner in egypt as proof of a renewed effort by terror groups, including isis, to target airplanes. Since the summer of 2014, passengers flying to the united screening of their electronic device, but in the u. S. , a government study last year found mock explosives routinely made it through security checkpoints. That undercover investigation led to a shakeup at t. S. A. , and, scott, under new leadership, the agency is working to enhance xray units and training. Pelley jeff pegues, thanks. And tonight the pentagon is claiming a big victory against alshabaab terrorists in one of the biggest counterterrorism strikes in years. U. S. Warplanes have reportedly killed 150 people over the weekend at what the military says was a terrorist training camp. David martin is at the pentagon. David . Reporter scott, pentagon Officials Say they have been watching the camp located about 120 miles north of mogadishu for weeks. About 200 fighters for alshabaab appeared to be preparing for major attack force, which includes about 50 americans as advisers. The strike was launched on saturday. Armed drones and armed aircraft caught the fighters lined up out in the open for what appeared to be their Graduation Ceremony and according to pentagon estimates, as many as 150 of them were killed. If that estimate is correct, that would make this one of the single deadliest strikes against terrorists ever. One defense official said they were sitting ducks. Pelley david martin at the pentagon. David, thanks. In iraq, there is fierce fighting outside mosul, a city of two million, the largest city controlled by isis. Iraqs army and kurdish forces, trained by the u. S. , have been planning to retake mosul, but they have been delayed time and again. Holly williams went to the front lines. [explosions] reporter 20 miles from are jumping. This was the response when they spotted two suspected isis gunmen approaching their post. The day before isis managed to break through the front line in its biggest attack here in months. The kurdish soldiers pushed them back and told us they killed nearly 100 fighters. Crossing into nomansland, we inspected all that remained of a humvee, detonated by the suicide bomber driving it. Just one driver inside . Isis will doubtless use the same ruthless tactics to defend mosul. Isis is thought to have several thousand fighters in mosul, but now theyre stopping civilians from leaving the city, which means effectively that isis has more than a million human shields. When isis swept across northern soldiers ran away. Now american troops are back, training the National Army to retake the city. Colonel scott mellman, an american adviser to the iraqi coalition, told us this time the American Coalition has shaped a different army. The scales they are received, how the breech mine field, how to defeat improvised explosive device, these are skills they didnt have previously. Reporter but will they stay the course . General najim aljobori told us hell lead the mosul offensive when it finally begins. I think about 75 or 80 of the people in mosul will support us. Reporter 80 will support you . Yes, yes. Reporter but 20 are still supporting isis . Yes, isis. Reporter but just after that, a phone call from the Iraqi Ministry of defense ordered the general to stop the timing of the mosul offensive is so sensitive. But, scott, as u. S. Intelligence officials told Congress Last month, its unlikely mosul will be recaptured before next year. Pelley Holly Williams reporting from Northern Iraq tonight. Holly, thank you. Late today a jury award rd sportscaster erin andrews 55 million. A stalker had secretly recorded her naked in a hotel, marriott franchise, and anna werner is at the courthouse in nashville. Anna . Reporter scott, the jury deliberated for just a single day and then came back with that award. They found both her stalker and the owners and operators of the hotel here in nashville at fault. Now, that verdict came eight years after her stalker David Barrett shot naked video of an andrews through a peephole in her hotel room door. He then posted those videos millions of people. Last week andrews gave tearful testimony talking about how all of this has affected her. She said she suffered humiliation, embarrassment and shame. Now, the attorneys for the two companies that run the hotel could not tell me tonight how theircation went wrong. They said they havent been able to talk to the jurors yet, but those two companies will be responsible for nearly half of that 55 million award. Her stalker, barrett, is legally responsible for the rest of the money. We watched tonight scott as the jurors left the courtroom. Andrews thanked each one of them personally on the way out. A couple of them reached out the hug her, one even asking for her autograph. Pelley anna werner, thanks, anna. Today president obama ordered flags flown at halfstaff in honor of nancy reagan until after her funeral on friday at the Reagan Library in california where she will be laid to rest alongside the former president. The former first lady, who died the library on wednesday and thursday so the public can pay its respects. Lesley stahl of 60 minutes back in the reagan years was covering the white house, and you knew the president and the first lady well. What do you remember about nancy reagan . Well, i guess first off how much she grew as first lady, because she came in and she was interested in clothes and shopping, and by the end she had become one of the president s Foreign Policy advisers, domestic policy advisers, image guru, and she just developed and you watched it happen. Im really happy to see thing from at halfstaff on the white house like that because our first ladies are never really appreciated for how much they contribute to the success of the presidency theyre involved in, but also, you know, helping keep the country together. And she did that. Pelley mrs. Reagan was an influence on her husband in policy matters . Everybody knows that she pushed him into a detente with gorbachev at the soviet union, but she was also trying to get him to stop talking as much as he was on the social issues, the more conservative issues he was taking, for example on abortion and gun control. Of course, he didnt always listen to her. Pelley she was a power behind the throne you would say . Absolutely, no question about it. She was protecting him. She was protecting his image and she was protecting the presidency. Pelley but it was an authentic love story . Oh, complete. You see it on camera and it was real. Drew lesley stahl of 60 minutes. Lesley, thank you. My pleasure. Pelley our bill plante covered the white house, and hell be along later with how nancy reagan worked for change. Also tonight, an historic uterus news continues. This is joanne. Her long day as a hair stylist starts with shoulder pain when. Hey joanne, want to trade the all day relief of 2 aleve with 6 tylenol . Give up my 2 aleve for 6 tylenol . No thanks. For me. Its aleve. You both have a perfect driving record. Perfect. No tickets. No accidents. That is until one of you clips a food truck, ruining your perfect record. Yeah. Now you would think your Insurance Company would cut you some slack, right . No. Your insurance rates go through the roof. Your perfect record doesnt get you anything. Anything. Perfect. For drivers with accident forgiveness, Liberty Mutual wont raise your rates see Car Insurance in a whole new light. Liberty mutual insurance. To receive a transplanted uterus. The surgery offers new hope for women with infertility. More from our cbs news contributor dr. Tara narula. Route it was an emotional moment for the 26yearold patient identified only asselin as lindsey. I want to be open and honest and share my story. At 16 i was told i would never have children. Reporter the procedure is designed for women who are either born without a uterus, had it removed during hysterectomy or have one that doesnt function following infection or other surgery. Dr. Rebecca flyckt was part of clinic. Women really crave that experience of carrying their own pregnancy, of feeling the baby grow, of feeling the baby kick, and we know that those women will get that experience through uterus transplantation. Reporter before the surgery, lindsey had her eggs a deceased donor was found and the uterus was transplanted during a ninehour surgery. Shes first of ten women who will undergo the experimental procedure to see if healthy babies can result. There was one moment at the end of the case whenever everything was stable and we looked and saw the uterus start to pink up that we realized that we were making history in the united states. It was very exciting. Reporter the plan is for lindsey to have one were to babies via csection and then the uterus will be removed so she does not have to take antirejection drugs for the rest of her life. Pelley amazing. Thank you, doctor. Peytons place in nfl history is secure. James background on the end of an era next. And congestion. No other nasal allergy spray can say that. When we breathe in allergens our bodies react by over producing six key inflammatory substances that cause our symptoms. Flonase controls six. And six is greater than one. Complete allergy relief or incomplete. Let your eyes decide. Flonase. 61 changes everything. Dont let a cracked windshield ruin your plans. Trust safelite. With safelites exclusive on my way text youll know exactly when well be there. Giving you more time for what matters most. team sing safelite repair, safelite replace. These little guys . They represent blood cells. And if you have afib an irregular heartbeat that may put you at five times greater risk of stroke they can pool together in the heart, forming a clot that can break free, and travel upstream to the brain where it can block blood flow and cause a stroke. But if you have afib thats not caused by a heart valve problem, pradaxa can help stop clots from forming. Pradaxa is not for people who have had a heart valve replacement. Dont stop taking pradaxa without talking to your doctor. Stopping increases your risk of stroke or blood clots. Ask your doctor if you need to stop pradaxa before any planned medical or dental procedure. Pradaxa can cause serious, and sometimes, fatal bleeding. Dont take pradaxa if you have abnormal bleeding. And seek immediate medical care for unexpected signs of bleeding, like unusual bruising. Pradaxa may increase your bleeding risk if youre 75 or older, have kidney problems, stomach ulcers, a bleeding condition, or take certain medicines. Side effects with pradaxa can include indigestion, stomach pain, upset or burning. Dont just go with the flow. Go with pradaxa, the only blood thinner that lowers your risk of stroke better than warfarin and has a specific reversal treatment. Talk to your doctor about pradaxa today. Seems like weve hit a road block. That reminds me. Gas, bloating . Yes one Phillips Colon Health probiotic cap each day helps defend against occasional digestive issues. With three types of good bacteria. Live the regular life. Phillips. Well, i thought the good fight. I finished my football race. And after 18 years, its time. God bless all of you, and god [applause] pelley Peyton Manning announcing his retirement today. Among our blessings, we count james brown, host of the nfl today and our cbs news special correspondent. J. B. , why now . Reporter scott, Peyton Manning is choosing to go out on top. His 24 u. N. Wins are the most of any quarterback in history. Hes the only quarterback to win two super bowls with two different team, but it was a season marred by injury and by his own admission a decline in his skills, which is why it was time to go. Pelley some controversy, as well. Reporter no question. In December Al Jazeera america accused him of doping, something he denies. And with respect to Sexual Assault sal allegations in his college years, he said hes not going to relit gait something that happened 20 years ago. Pelley hall of fame . Reporter anybody who votes no ought to have their head examines. This portion of the cbs evening news is sponsored by pacific life. For life insurance, annuities and investment, choose pacific life, the power to help you succeed. Call it planning for retirement because getting there requires exactly that. A plan for what you want your future to look like. For more than 145 years, pacific life has been providing solutions to help individuals like you achieve longterm financial security. 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She was very involved behind the scenes, and she influenced the president on many major decisions and also went public on some controversial issues positions. Over those eight years in washington and of the exaggerated ups and downs of life at the white house, i found what was really important, i found how to serve. Reporter reluctant at first the talk of personal matters, mrs. Reagan went public in 1987 with the fact that shed had a mastectomy following a dying know six of breast cancer. At the time the procedure was seen as a radical step, but the first lady used her decision to mammograms. In 1985, the reagans friend, actor rock hudson died of aids. It put a personal face on the epidemic for mrs. Reagan. Even sew, it took three more years for her to convince the president to mention the disease in public. Aids affects all of us. Reporter their son ron describes the process to cbs. He could personalize an issue, either because of the some other way, that was the way you got to him. She was well aware of that, of course. Reporter by 1994, the Ronald Reagan his wife knew and loved began the long slide into the darkness of alzheimers. Mrs. Reagan believed that Stem Cell Research offered promise for the disease. She promoted it, breaking with president bush and conservative republicans. I just dont see how we can turn our backs on this. There are so many diseases that can be cured or at least helped. Reporter nancy reagan went on the raise millions for alzheimers research. It was the last act of a life lived quietly but with fierce determination. Bill plante, cbs news, new york. Pelley and thats the cbs evening news for tonight. For all of us at cbs news all around the world, good night. Captioning sponsored by cbs access. Wgbh. Org the insider, counting down the biggest stories tracking today. Number one, Kelly Clarkson dr. Lukes blackmail claim. Hes just not a good guy and hes kind of difficult to work with. Kind of demeaning. Why kelly said she was intimidated into working with the mega producer. And her take on his court case with kesha. When you have that poor a character like so many artists dont like you, thats not normal. Then Kim Kardashian gets slammed on social media after posting a nude selfie and why did the confrontational kanye just thank the paparazzi . I really appreciate you guys. And the royal familys