You dont think about it until you see it on tv. Whether youre in it, it makes you think. We won a big, big victory in West Virginia. Hillary clinton still facing a stubborn Bernie Sanders on her left. I am looking forward to debating donald trump come the fall i think he loves this party. He loves this country and wants to see something good happen. I think were going do better if were unified. We shouldnt just pretend that our party is unified when we know it is not. Theres a very, very, bitter divisive primary. Car bomb explosion at a busy outdoor market in baghdad wounded dozens. Isis has claimed responsibility. The car dove in. A wild stabbing rampage at a massachusetts mall. The attacker killed by an offduty cop. I heard about five gunshots. From the wildfire zone in Canadas Alberta province, this upclose look at firefighters saving a home. Mother in ohio is still on the run tonight after leading police on a wild chase with her child inside her minivan. All that steph curry made history becoming the firstever unanimous mvp. 3yearold riley was not going to miss the presentation. My goodness. The ball boy made a heck of a catch. All that matters a report that facebook selectively chooses what is trending on its site based on political bias. The only thing i want to see on facebook is people who were mean to me in high school now fat and bald. On cbs this morning. Victoria beckham admit that while performing with the spice girls, her microphone was usually turned off. Crazier, bernies mooik has b has been turned off this whole time. Welcome to cbs this morning. Another blast of Severe Weather today could cause even more destruction in the Central United states. There it goes at least ten people were hurt after tornadoes touched down yesterday in western kentucky. Twisters were also reported in illinois and nebraska. More violent thunderstorms could hit the central and eastern United States today. Jericka duncan is in mayfield, kentucky, where several buildings are damaged. Good morning. Reporter good morning. There is debris scattered throughout this entire community. Look at this car underneath this mound of wreckage. This pile is the result of a trailer home and an auto body shop that were instantly destroyed when the tornado struck. Look at that look at that reporter fastmoving winds formed a funnel cloud over mayfield, kentucky, within seconds on tuesday. [ siren ] reporter the storm damaged homes and businesses, narrowly missing several schools. It was just black as can be, and you could see it. We seen it coming out of the sky. Reporter communities sorted through the damage into the night. All i know is the tornado come through here. My parents when i seen them, i fell to my knees that they were okay. Reporter carol leadership carol lipp said her parents escaped just in time. A neighbor knocked on the door and said, theres a tornado. They made it from here to here. Reporter martie win free helped get the couple to safety. I immediately run to my neighbors and beat on the door and said you got to get out. The tornados right there. Reporter about 100 miles northeast of owensboro, hail and rain flooded streets and back yards. The Severe Weather is connected with a system that spawned violent tornadoes across southern oklahoma on monday, killing two people and leveling several homes. Brooke carter was relieved her mother survived. She made it out alive. Her neighbor didnt. But were glad that we have her. All this stuff can be replaced. Reporter back here in mayfield, these cars, these violent winds pretty much destroyed these cars. They were tossed around like childrens toys. This one behind me stacked on top of this truck here. And we counted in this parking lot at least 60 cars that were damaged from the tornado. And we are not out of all of this bad weather just yet. More Severe Weather is expected today in the Southern Plains and the midwest. Gayle . Wow, those pictures tell the story of how strong those winds were. Thank you very much. Police say a deadly stabbing spree in massachusetts could have been much worse if not for one mans heroic action. Two victims were killed in this rampage. At least five others were attacked. An offduty sheriffs deputy shot and killed the attacker. The motive for the stabbings remains unclear today. It started at a home and ended inside a shopping mall. Anna westerners outside the mall in taunton, south of boston. Good morning. Reporter good morning, gayle. As you said, this is one of two crime scenes here in taunton. Police are keeping us back, but if you look, you might be able to see the plywood covering the entrance to that macys. That is where police say 28yearold Arthur Derosa crashed his car, then walked in and started attacking people. That was after he attacked several people at a scene three miles from here. When it was over, police say he and two others were dead. Report is an offduty Police Officer shot somebody. Reporter a deadly stabbing spree ended in gunfire inside this bertuccis restaurant in taunton. An offduty Deputy Sheriff fired one shot killing the suspect, Arthur Derosa, before he killed anyone else. There was a pregnant lady who came out. She was holding her stomach, screaming and crying to save her baby. Help her. Reporter derosa first rammed his car through the front of this macys, and armed with a knife walked inside the mall and started his attack. Tragedy certainly hit the city of taunton hard this evening. Reporter two people were stabbed in two separate locations. This couple spotted a young girl hiding in the bushes outside the mall. You could tell she was scared for her life. She saw a guy walk in and grabbed a chair. Hurt one of waitresses. She saw him stab the waitress. Reporter police say the blo bloodshed started more than three miles away. Derosa crashed his car into a truck before stabbing a mother and daughter in this home. One of the women has succu succumbed and died at the hospital. She was 80 years old. Reporter the death toll could have been worse if not for the offduty sheriff who shot the suspect, ending the rampage. It appears that but for the actions of the Deputy Sheriff, there may well have been other victims. Reporter Massachusetts State Police do not know the reason for this crime spree. They say terror is not their suspected motive here. One of the wounded survivors is facing life threatening injuries. Thanks. Two more primary wins bring donald trump closer to clinching the republican president ial nomination. Trump received 61 of the vote in nebraska yesterday and 77 in West Virginia. Cbs news estimates trump is less than 150 delegates short of a majority. Trump is getting ready for a unity meeting tomorrow with gop leaders in washington. Major garrett is on capitol hill. Major, good morning. Reporter good morning. Several prominent Congressional Republicans are still straddling the donald trump fence. House speaker paul ryan, ted cruz, and to a lesser extent, marco rubio. Still, other hill republicans have begun the slow migration toward trump. Thats a process he hopes to accelerate tomorrow with ryan. I would like to see unity in the party. Reporter presumptive nominee donald trump said thursdays meeting with House Speaker paul ryan might create new possibilities. I have a lot of respect for paul, and i think well have a very good meeting, i hope. I think he loves this party. He loves this country, and he wants to see something good happen. I want to have a conversation with him one on one. Reporter ryan said he was still looking for clarity. There are critical principles that we all believe in as conservatives that we want to make sure were all rallying around those principles as we move forward. Reporter representative chris collins, one of trumps earliest supporters in congress, said ryans decision ton endorse has had a chilling effect. I would admit for a week or so, it has frozen some things. They can all be unfrozen either this thursday or a week from this thursday. Imagine, we thought wed be still fighting for ten more weeks. Reporter you think youre ahead of the game . Were ten weeks ahead of the game. Thats huge. Reporter returning to his day job, texas senator ted cruz refused to utter trumps name or offer an endorsement. There will be plenty of time for voters to make the determination who theyll support. Reporter florida senator marco rubio, another vanquished trump rival, sounded equally vague. He is the presumptive nominee. That said, it doesnt change what ive said in the past. I stand by those things. If donald trump is our nominee, it will fracture the Republican Party. Reporter meaning rubios not backing away from this what hes trying to carry out is a scam. If we nominate donald trump, well lose. A con artist will never get control of this party. Reporter still says he would back the nominee. I signed a pledge, put my name on it saying i would support the republican nominee. Thats what i intend to do. Reporter trump says hes focusing on five or six finalist to be his running mate, and the priority is finding someone with washington political and legislative experience. But the new jersey governor, chris christie, is still on the list. Proof positive, norah, trump knows how to play the goesing game. Indeed. Thank you very much. Another primary win for Bernie Sanders is prolonging the democratic race. His victory in West Virginia doesnt change Hillary Clintons overall lead, but it is one more bump in her path to the general election. Sanders beat clinton by 15 points, 5136 . Cbs news estimates he earned at least 16 delegates, and she got at least 11. Clinton needs another 144 to clinch the nomination. Nancy cordes is in louisville, kentucky, where the Democratic Frontrunner could face more obstacles in next weeks primary. Good morning. Reporter good morning. Thats right, oregon is up next tuesday. Its the kind of progressive, mostly white state where sanders typically does very well. And he was there celebrating his West Virginia win last night. And so the clinton camp is putting more time, more money into this state, kentucky, which also votes next week and where clinton won in a landslide last time around. Weve won a big, big victory in West Virginia [ applause ] reporter sanders capitalized tuesday on opposition to clinton that runs so deep in West Virginia, 43 of sanders voters say theyll defect to trump in the fall if clinton is the nominee. A massive shift in a state clinton won by about 41 points in 2008. This time her record on free trade hurt her. So did this slipup were going to put a lot of coal miners and Coal Companies out of business. Reporter clintons repeated apologies did not heal the wounds. That is not what i intended at all. Reporter she could run into the same problem next week. Kentucky is the thirdlargest coal mining state in the country. Reporter its also her next chance to stop a sanders mini streak. Hello, louisville reporter she barnstormed the state on tuesday and began airing ads here. And shes the one who will make a real difference for you. Reporter the white house has tried to stay neutral in the primary, but Vice President joe biden weighed in tuesday on clintons behalf. I feel confident that hillary will be the nominee. I feel confident shell be the next president. Reporter sanders insisted clinton is still beatable even though she only needs to win about 13 of the delegates in the remaining eightstate contest. And let me be as clear as i can be we are in this campaign to win the democratic nomination [ applause ] reporter its easy to see why his supporters are still hoping against hope. Sanders has now won nearly as many states as clinton has 19 states to her 23. Its just that her states have been bigger, and she won some of those big states by large margins, putting the delegates that he needs, charlie, virtually out of reach. Thanks, nancy. Cbs news political director and face the nation moderator, john dickerson, is in washington. Good morning. Good morning, charlie. What is it that donald trump must do to get the speaker, paul ryan, on board . Well, its a twoway street, of course. Im not sure the central challenge is that usually what happens in these unity moments is that both sides feel each other out, and they recognize that Going Forward theyre going to have the same instincts. Donald trump and paul ryan have totally different positions and instinks on issues like trade, immigration, entitlements, taxes, tone. I mean, those are the big issues. What worries paul ryan and some other republicans is that donald trump is unpredictable. He loves being unpredictable, and that makes them nervous. He won the primaries in their party. He won the primaries. Hell win the nomination. He sure did, no question about that. They have their own both political future to think about, the primaries arent the entire electorate. The electiorate is different no. Secondarily, they have ideas that they believe in, and they just are in a totally different place than donald trump. They may be able to have a unity moment. When what they what they worry about is what does it look like as they go forward k. They stay in sync . Do they have Common Ground . They dont want to see Hillary Clinton be president. They want to see conservatives on the supreme court. But is that enough given how far apart they are on the issues, and also on tone . Remember that paul ryan came out and spoke out several times against or about things that donald trump said, but muslims, about white supremacists. So this goes pretty deep. John, one of the most something stories today is what Hillary Clinton said yesterday, that shes willing to support medicare buyin for those 50 and older s. And older. Is that what Bernie Sanders supporte supporters, what pushes them to the left . Well have to see how the fight goes with trump. Yes, thats part of what its done at least for the primary process. John dickerson, thank you very much for joining us today. We have breaking news from baghdad where isis claims responsibility for a massive car bombing this morning. Amateur video claims to show the aftermath of the attack in sadr city. Officials say the bomb killed at least 45 people. Me to developments in the controversy over whether facebook sensors news. Allegation of liberal bias are drawing scrutiny. Some say the network blocks stories about conservatives in its trending section. Jan crawford is at the capitol where Commerce Committee secretary john thune calls the issue serious. Reporter john thune is raising questions, facebook has launched its investigation into whether it filtered out conservative topics. Interestingly, this controversy trended for much of the day on facebook yesterday. Keep an open mind reporter in this video posted last month, facebook urged viewers to seek out opposing points of view. Maybe, just maybe its a good time to search for them. To find the other side of the story. Reporter south dakota senator john thune is worried the conservative side is being suppressed on the social network. In a letter sent to facebook tuesday, the south Dakota Republican asked if the trending topics were subjective and filtered to support or suppress particular political viewpoints. Consumers have rights, and wea want to make sure that were protecting consumers rights and that businesses arent in fact engaged in any deceptive practice. Reporter on monday, gizmodos Technology Editor said that facebook employs human curators who work off a list of stories generated by an algorithm. They select the items that become facebook trending topics. We have evidence of them blacklisting in a lost cases conservative news whats a particular story they blacklisted . The c pap conference. As that was going on, it was not allowed to trend. Reporter in a statement, facebook said it will keep reviewing our operational businesses around trending topics, and if we find they are inadequate, we will take immediate steps to change them. Cbs news contributor Nicholas Thompson says the controversy could reinforce a perception problem facebook had among conservatives. Its founder and chairman, mark zuckerberg, has recently taken positions supporting samesex marriage, immigration reform, and black lives matter. If republicans leave facebook, thats terrible for facebook. They cant afford to alienate the party that controls congress. Reporter now, that perception problem, that is really the issue because theres nothing that congress can really do. I mean, Media Companies are protected by the first amendment. Theyre not obligated to Tell Congress why they pick the story that they choose. You know, facebook, its denying the allegations. It can filter its stories however it wants. People have the choice of whether to use it or not. Gayle . Something tells me it will be trending again today. Thank you very much, jan. A doctor who saw prince the day before he died is the focus of the investigation into the stars death. Ahead, what a search warrant that was released by accident reveals about sending a message from the top of the world. Made, meet the American Climbers everest showing everybody their adventure. Hi, im adrian ball injury. Im Cory Richards. Were on the north side of mt. Everest at 21,000 feet. Right here, right now. Coming up cbs this morning, well show how were documenting our entire exhibition on snapchat. Stay tuned. Wow, the news is back in the morning. And its right here on cbs this morning. Yes, it is. With noninsulin victoza®. For a while, i took a pill to lower my blood sugar. But it didnt get me to my goal. So i asked my doctor about victoza®