Bernie Sanders' big win as candidates look to South Carolina

Sen. Sanders dominated in the Nevada Caucuses with 47 percent of the vote which has set up what could be a decisive showdown with Joe Biden in South Carolina.
3:22 | 02/24/20

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Transcript for Bernie Sanders' big win as candidates look to South Carolina
The race for the white house now, and that big victory weekend for Bernie Sanders. The democratic front-runner now after capturing 47% of the vote at the Nevada caucuses setting up what could be a decisive showdown with Joe Biden in south Carolina just five days away. Eva pilgrim is in Charleston with the latest. Good morning, Eva. Reporter: Good morning, George. For the first time this election cycle, the Democrats have a clear front-runner. Bernie Sanders not just winning in Nevada, but winning big. This as we're about to hit the busiest stretch of the campaign season yet. This morning, feeling the Bern. I am a U.S. Senator and I got a big ego and I appreciate the Bernie, but it ain't Bernie. It is us. Reporter: Bernie Sanders dominating in Nevada, using that momentum to propel him into South Carolina and super Tuesday. Sanders not only taking the silver state, but besting his rivals among Latinos winning both men and women, college and non-college graduates and even scoring votes from moderates. The democratic socialist admits this wave of success is surprising even him. It is a bit shocking, I will agree. Reporter: But a potential stumble amid his surge in popularity. Sanders drawing criticism for comments on communist leader Fidel Castro. We're opposed to the authoritarian nature. You can't say everything is bad. When Fidel Castro came into office, you know what he did? He had a massive literacy program. Is that a bad thing even though Fidel Castro did it? Reporter: Joe Biden hitting heard on Sanders' electability. I don't think he can beat Donald Trump and keep a democratic senate or get a democratic senate and keep a democratic house. Reporter: Making what could be his last stand in the palm meadows state. Biden's camp saying since the start that the road to the nomination would come through South Carolina. Now we wait to see if his firewall will hold here. What I'm expecting is to make the case to the people here in South Carolina that they have an opportunity to essentially determine who the next president is. Reporter: Biden, not the only one needing to have a good night in South Carolina. Others in that crowded field of moderates feeling the pressure to prove themselves or risk simply knocking each other out, clearing the path for Sanders. My parents taught me hard work. Reporter: And looming over them all, Mike Bloomberg. The former New York mayor skipping the first four contests focusing on the super Tuesday states. Bloomberg spending $381 million in ads so far. And it really is crunch time. South Carolina this weekend, eight days from now is super Tuesday. We're about a third of the delegates are up for grabs making this week's debate even more important. Another big one. As you said, South Carolina is a must-win for Joe Biden, and he's hoping to score a key endorsement this week. Reporter: That's right, George. ABC news has heard from multiple sources that they expect house majority whip Jim Clyburn will endorse Joe Biden. You know that is a big get for the former vice president. Most prominent Democrat in the state. Eva, thanks very much.

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

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