Former President Bill Clinton will campaign for his wife in Charleston on Saturday, a day before her Democratic rival, Sen. Barack Obama, is to speak in this early voting state alongside media mogul Oprah Winfrey.

New York Sen. Hillary Rodham Clinton's campaign confirmed Friday that the former president plans to make a campaign trip to the coastal city. The time and place of the appearance were not immediately made public.

Bill Clinton, who has made several trips to South Carolina this campaign season, already had been scheduled to return for an event honoring former Gov. Dick Riley in Columbia on Dec. 17.

The high-profile assists to the two campaigns come as a recent Associated Press poll shows Hillary Clinton with a strong lead in this early voting state. The two campaigns are in part vying for the critical black vote in South Carolina, where blacks make up nearly half the Democratic primary vote. The AP-Pew Research poll shows them breaking even on the black vote.

Winfrey, the popular talk show host, plans to visit Iowa to campaign with Obama on Saturday before heading to Columbia. Earlier this week, the Illinois senator's campaign shifted Sunday's event from an indoor arena to the University of South Carolina's football stadium, saying there had been an overwhelming demand by people who wanted to attend.

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