CNN town hall: Clinton, Sanders make pitch to minority voters.

Clinton is counting on a strong showing in Southern states likely to showcase her dominance among African-American voters, putting the onus on Sanders to try to broaden his support or face falling behind. The Vermont senator clearly appreciates the urgency and is taking an increasingly tough line against the former secretary of state.

He opened the town hall by reiterating his call for Clinton to release transcripts of paid speeches that she made to Wall Street banks after she left the State Department.

"I am happy to release all of my paid speeches to Wall Street -- here it is," Sanders said, with a wave of his hands. "There ain't none."

Clinton, who appeared on stage after Sanders, sidestepped questions about the senator's call for her to release her speeches.

"If everybody does it, and that includes the Republicans -- because we know they have made a lot of speeches," Clinton said.

She said the real issue was about who had the best plan to crack down on Wall Street.

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