Trouble is your thinking that merely because white Americans voted for a black man they can't be racist.   Racism exists on a spectrum from those that can't stand to even see a person of color exist, to those that tolerate their existence as long they they stay in their place. Voting for Obama doesn't prove you aren't racist any more than hiring a filipino to cut your lawn or a black to clean your house, or play NFL football.

But voting to elect an openly blatant racist to be president is in and of itself a racist act.   Own it.