Republicans are supported by whites with prejudice against blacks.

Source: Bankrupt -- The Intellectual and Moral Bankruptcy of Today's Democratic Party, by David Limbaugh, 2006, page 190.
Hardcopy: Copy of page 190 from Limbaugh's book.
Where: As quoted in "Study Ties Political Leanings to Hidden Biases," by Shankar Vedantam, Washington Post, January 30, 2006.
When: Probably January 2006.
Contributor: AIM.

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