It's possible, some states have laws that require electors to vote for the winner, but some don't. West Virginia doesn't and a Republican elector, said before the election that if Bush won, he might not vote for Bush, After the election he said that Bush won by such a large margin, he might go ahead and vote for Bush. In 2000 some of the rats tried to get info on electors and get them to switch or not vote, a Dem elector from D.C. decided not to vote in 2000
So the voter from Minnesota, who voted for Edwards, might be the only surprise.
I have not seen any place that has posted the results -- does that mean it happens tomorrow -- when DU is truly sad.