Obama probably won't win the white vote in 2012. Let's be honest, this is still America and we're still pretty screwed up when it comes to race relations. The extreme right will still be able to convince enough of white America that the "black is taking over". It was pretty damned hard for WASP Democrat males to win the white vote before Obama, I don't know why it'd be any easier.
On the other hand, there is the case of White Guilt to consider.......
White guilt exists only among white liberals. Notice, too, that there is no such thing as Black guilt or Hispanic guilt, ostensibly because these races lack feelings.
Oh, come on. Liberals don't feel any more guilt than conservatives.