Joe Biden endorsed by South Carolina Rep. Jim Clyburn

On the debate stage, Bernie Sanders' rivals argued that he would not be able to defeat President Trump.
2:55 | 02/27/20

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Transcript for Joe Biden endorsed by South Carolina Rep. Jim Clyburn
We turn next to the race for 2020 and the countdown to south Carolina. The primary there. And tonight, Joe Biden with a major endorsement in that state. It comes after Democrats took on the front-runner on the democratic side, Bernie Sanders, in the debate overnight. Today, Biden getting that endorsement from representative Jim Clyburn. ABC's Mary Bruce in Charleston tonight with the latest. Let's go Joe! Reporter: Today in South Carolina, Joe Biden got a big boost. The coveted endorsement of the state's most powerful Democrat, congressman Jim Clyburn. I know Joe. We know Joe. But most importantly, Joe knows us. Reporter: Biden is promising voters a comeback. I promise you this -- if you send me out of South Carolina with a victory, there will be no stopping us. Reporter: Bernie Sanders says that won't happen. Joe is a friend of mine and a decent guy, but that is not the voting record or the history that is going to excite people, bring them into the political process and beat trump. Reporter: But on the debate stage, Sanders' rivals argued he is the one who won't be able to take on trump. Vladimir Putin thinks that Donald Trump should be president of the United States, and that's why Russia is helping you get elected. Oh, Mr. Bloomberg -- So that you'll lose to him. Reporter: Sanders fired back. Hey, Mr. Putin, if I'm president of the United States, trust me, you're not going to interfere in any more American elections. Reporter: It was a pile-on. The candidates pummeling the front-runner. If you think the last four years has been chaotic, divisive, toxic, exhausting, imagine spending the better part of 2020 with Bernie Sanders versus Donald Trump. Think about what that will be like for this country. Reporter: Biden, eager to stunt Sanders' momentum, slammed him on everything from health care to gun control. Bernie, in fact, hasn't passed much of anything. The fact of the matter is -- Reporter: Sanders unfazed. I'm hearing my name mentioned a little bit tonight. I wonder why. We knew that incoming fire would come and certainly did overnight. Mary Bruce live in Charleston again this evening for us, and Mary, president Obama has been largely quiet in this race, but he's been drawn in a bit in this South Carolina primary after an ad. His office now issuing a rare statement tonight? Reporter: David, president Obama is calling on TV stations here to stop running a Republican ad that is taking Obama's words out of context to attack Joe Biden. Today, Obama's office, in a rare statement, saying the ad, quote, is clearly designed to suppress turnout among minority voters in South Carolina and is twisting his words to mislead voters. David? All right, Mary Bruce on the campaign trail for us. Mary, thank you.

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

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