No more tickets for Oprah in South Carolina

Citing "overwhelming excitement," Barack Obama's campaign in South Carolina is out of free tickets for this weekend's rally with Oprah Winfrey, a signal that Oprah's impact could be significant in this state where Obama is still trying to introduce himself to primary voters.

Though Oprah's appeal certainly transcends race and class, black women are proving to be a key subset of voters in South Carolina, and Oprah's presence on Sunday could be help raise Obama's profile in a state where Sen. Hillary Clinton is still more well-known.

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