Key Democratic primary playing out in South Carolina

Joe Biden is facing a crucial test saying a win could propel him on a path to the nomination, while Bernie Sanders is campaigning in three Super Tuesday states.
2:46 | 02/29/20

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Transcript for Key Democratic primary playing out in South Carolina
A credit primary playing out right now in South Carolina and based on analysis of the exit polls ABC news can project to see it right there Joseph Biden will win the South Carolina primary. Preliminary exit polling choke by its popularity there with 76%. Favorability among democratic voters. Asked which candidate best understands the concerns of racial ethnic minorities. More 42% say Biden than any other candidate in the race. The front runner though Bernie Sanders projected to finish second and already looking ahead campaigning in three Super Tuesday states today. Let's get right to ABC's Rachel Scott a what's know what Joseph Biden victory party in Columbia, South Carolina. And tonight Joseph Biden Victorian Norwich. Reverberate in broad. In the most critical had to get up his campaign. The corporate VP pounded on south Carolina's billion insist Super Tuesday with mom Manson. And put him on the path for the nomination and they turned down. But slow comeback starts in South Carolina and dads had that goes Sara Joseph. What made it. And ordered away South Carolina. Divided and being helped fund raised and outspent in the crucial upcoming state including Massachusetts. When today front runner senator Bernie Sanders hit a crowd of thousands. The establishment. Is getting very nervous about I'll campaign. And tonight they're gonna turn on the TV. And they're gonna find a 101000 people came out to the Boston commons. And they're going to become an even. More nervous. Like Tuesday about 40% of the delegates will be awarding. Seen as Kat the delegate lead and his rivals are scrambling to stop him. And that it is on the Super Tuesday which is less than 72 hours from now I. Yeah we are going to be going into the Super Tuesday states have a state like Colorado or state like Virginia strong. All right Rachel Scott joins us now from Joseph Biden's victory party in Columbia, South Carolina we could see the crowd they're getting larger and larger. Waiting for the former vice president behind you bridging you've been following the bloody campaign for weeks now. He's told you he will get a boost from South Carolina. That's right talk I didn't hate how that's tonight again Cain is ecstatic. I didn't really a lot riding on his bed and audit its firewall he was on black voters make up 56% of the electorate here to turn out for him. Well according to our early exit polls. 85% of black voters that they have a positive view of the former vice president Tom. Deathly some momentum heading to Super Tuesday all right Rachel think.

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

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