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It's American election season and that means it is time for psychologists to introduce racism again - not whether you are racist, but how much.

Well, only white people are, said a talk at the Annual Convention of the American Psychological Association. Even if they do not have any racist thoughts or lock their car door when they see a young, black man on the sidewalk and voted for Obama in 2008, white people still are; and their racial attitudes, both conscious and unconscious, may be a significant factor in this year's U.S. presidential election. A survey says so.