I don't remember where I posted it, but fivethirtyeight.com showed some numbers that said 6% of responders would not vote for Obama because he is black, while 9% said they would vote for Obama simply because is black. You've got to figure that the 6% number is low (the Bradley effect), but even with that fudge factor built in, the idiots pretty much balance each other out.
But none of that has anything to do with the hateful questioning of Powell's motivations. Cause, really, he's shown himself to be such a racially motivated wag in his career, right?
ETA: re: GC, he's also since made it known that he was very much on the outside of the administration and fed very distorted information and that he very much regrets being involved and influential in that decision making process.