Transcript for Democratic candidates gear up for South Carolina debate
now and what could be a decisive battle in South Carolina. Seven candidates on the stage there tonight with front-runner Bernie Sanders sure to be targeted for hit defense of socialism and Fidel Castro. The state a must win for Joe Biden and Michael Bloomberg hoping to get back in the game after his debate fail last week. Eva pilgrim is tracking it all. Good morning, Eva. Reporter: Good morning, no question, Bernie Sanders will be the target of a lot of those attacks. This debate tonight is critical. It's the last one before south Carolina and super Tuesday. Bernie Sanders squarely in the lead with a target now on his back. The attacks coming from every direction. Bernie supports the filibuster, I want to get rid of the filibuster because I want to get something done. I profoundly disagree with his solutions. Most Democrats are looking for a different answer than what senator Sanders is offering. Reporter: New ads attacking Sanders are also being released from former New York major Michael Bloomberg and Joe Biden also taking on Sanders in this new ad. When it comes to building on president Obama's legacy, Bernie Sanders can't be trusted. Reporter: Despite the onslaught, Sanders appearing unfazed. It all starts here? South Carolina. It starts here for real. Reporter: Tonight's debate crucial for the former vice president and former front-runner who must win south Carolina to have any realistic chance at the nomination. Do you think you can win here. I know I can. Reporter: By enough? By plenty. Reporter: And Michael Bloomberg also looking for a debate redemption tonight, George. He has to turn it around at this debate. Eva pi, thanks very much. South Carolina votes on the big contest a week from today. Super Tuesday, 15 contests that could decide the nomination. I'll be anchoring our special coverage with our political team starting at 8:00 eastern.
This transcript has been automatically generated and may not be 100% accurate.