It was racism that caused Americans to secede from the British crown. It was racism that caused the Yugoslavians to secede from the Soviet Union (just ask Trotsky!) It was racism that caused Indians to secede from Britain -- that racist jerk Gandhi needs to be put in his place! It is racism that causes Tibetans to want independence from China. It is racism that Indonesia is no longer a Dutch colony. Oh, and I bet you Prince Pedro was being racist when he decided to secede from Portugal, too.
I'm going to say something that is sure to get me negative kharma from the polemicists but couldn't it be possible that people are dissenting on the policies of the president rather than on the race of the president?
I got a lot of crap from my family when I told them that I was voting for Obama. Yeah, they were kind of bigots about it. But if you can't actually try to speculate on the rational reasons somebody might want to secede and just chalk it up to "they hate black people" that makes you guilty of bigotry, too.