Joe Biden relishes stunning comeback on Super Tuesday

Michael Bloomberg dropped out of the race and pledged to keep his checkbook open to help defeat President Trump.
3:40 | 03/05/20

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Transcript for Joe Biden relishes stunning comeback on Super Tuesday
The other major story tonight, Joe Biden's historic comeback, expanding his winning streak today, adding Maine, winning ten states in super Tuesday voting, including Amy kobe klobuchar's state of Minnesota. And in Texas, Bernie Sanders winning three states and still leading in California where votes are still being counted. What Joe Biden said today when asked, is this the establishment trying to stop Bernie Sanders? And tonight, what Sanders is now saying about the race ahead. Mike Bloomberg dropping out today, endorsing Joe Biden. And the phone call that Elizabeth Warren had with Bernie Sanders brs today. ABC's Mary Bruce tonight with the reshape MD race for president. Reporter: Joe Biden today is relishing his stunning comeback. Look, we're going to bring together all Americans and we did that and we showed that last night. Reporter: The former vice president swept 10 out of 15 super Tuesday contests, including upsets in minnesota and Texas. They don't call it super Tuesday for nothing. Reporter: He also won two states in Bernie Sanders' backyard, massachetts and Maine. We were told, well, when it got to super Tuesday, it would over. Well, it may be over for the other guy. Is this the establishment trying to beat Bernie Sanders, Mr. Vice president? The establishment are all those hard working middle class people and those African-Americans, those single women in suburbia, they're the establishment. Reporter: Today, the best week of Biden's campaign got even better. And I'm glad to say I endorse Joe Biden and I hope you will join me in working to make him the next president of the united States of America. Reporter: Michael Bloomberg poured more than half a billion dollars into his campaign, only to win just one contest -- dropping out today, he pledged to keep his checkbook open to help defeat president trump. I will not be our party's nominee, but I will not walk away from the most important political fight of my life and I hope you won't walk away, either. Reporter: Bloomberg's exit came as news to Sanders. Well, first I heard about that. He certainly brought a lot of money into this race. I suspect we will see, you know, a lot of money coming into Biden's campaign, probably a lot of negative ads attacking me. Reporter: Sanders winning Utah, Colorado and his home state of Vermont. And he's leading in California. But today, he was blunt. Of course I'm disappointed. I would like to win every state by a landslide. It's not going to happen. What we are trying to do is unprecedented, all right? We are talking about a political revolution. Reporter: Some Sanders supporters are turning up the heat on Elizabeth Warren to drop out and endorse her fellow Progressive. But Warren's team says the Massachusetts senator is taking time to assess. She and Sanders spoke this morning. It is important, I think, for all of us to respect the time and the space that she needs to make her decision. Mary Bruce with us now. And Mary, we were on the air until 2:00 A.M. Hope you had a little bit of we know this is Joe Biden's third run for president. His win in South Carolina was his first primary win ever. Then this streak. It kind of shows that the endorsement from Jim Clyburn, Amy klobuchar, that momentum was worth a lot more than money. Reporter: In some states, this was all about pure momentum. Joe Biden won in states where he never visited, spent very little so, the question is, how does he build on this comeback? How does he seize this momentum? That will be tested next Tuesday when several states vote, including Michigan and Washington. Mary Bruce, thank you. We turn onto the other news

This transcript has been automatically generated and may not be 100% accurate.

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