In January 2000, McCain won the New Hampshire primary and was poised to win in South Carolina too, until Karl Rove's vicious smear campaign derailed things pretty nicely for him:
Rove invented a uniquely injurious fiction for his operatives to circulate via a phony poll. Voters were asked, "Would you be more or less likely to vote for John McCain...if you knew he had fathered an illegitimate black child?" This was no random slur. McCain was at the time campaigning with his dark-skinned daughter, Bridget, adopted from Bangladesh.
McCain later said there was a special place in hell reserved for the people who spread those rumors. Well, guess what? On Monday, McCain hired the guy who helped spread those race-baiting rumors!
That's nice. Obama topped 50% today, probably as undecided independents finally begin hopping off the fence, and instead of campaigning to the middle where the votes he needs to win lie, he moves further to the already-secured right by tossing meat to the base with the disastrous choice of Palin, then hiring the guy he once thought belonged in hell.
I suppose the point -- if there is one -- is that people already inclined to vote for him (or against Obama; those aren't necessarily the same things) won't care about this. They just want him to win; want the last eight years to continue without a break.
They can have him.