The new Obama ad in Iowa. He's pulling even with Clinton in South Carolina. The reason? African-Americans are switching - perhaps because they sense that he is indeed electable:

Obama’s showing has improved significantly among black voters. He now attracts 51% of the African-American vote in South Carolina while Clinton picks up just 27%. A month ago, the candidates were even in this important constituency (Obama 46%, Clinton 45%). There is virtually no movement among white voters in the state--Clinton now earns 43% of the white vote, Edwards 22%, and Obama 17%.

 

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