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After a brawling presidential contest in Nevada, Clinton heads into the next battleground of South Carolina with back-to-back victories. For Obama, whose Jan. 3 Iowa victory recedes with time, South Carolina is where he must regain his footing in time for the Feb. 5 megacontest when 22 states will be in competition. Obama is relying on black voters, who make up more than half of the South Carolina Democratic electorate. Most polls have him leading Clinton in the state. But Clinton has won over many influential black leaders and had led in the state before Obama's Iowa victory established him as a strong contender.