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"Does a victory in South Carolina, based on the African-American vote, undercut Obama's biracial strategy and get him tagged as a black candidate?"
What a short-sighted question. Obviously a win is going to help Obama more than a loss. A win is a win. No one is going to change their minds about Obama because he WON South Carolina. A win will only enhance his appeal among all voters.
It's not like Obama supporters are going to wake up on Sunday after Obama's win in South Carolina and suddenly change their votes. It will only strengthen their cause. And if you didn't like Obama before a South Carolina win, you are not going to like him any less because of one.