I wouldn't be so sure.
I know this is anecdotal, but my entire extended family lives in Southern Ohio. All of them voted for Hillary! in the primary. 2/3 of them voted for Kerry against Bush. Not a single one of them is voting for Obama.
I don't dare ask them the reason because I don't think I want to know, but I have to believe they are not alone.
My wife voted for Obama, whom she would never vote for in a general, just because she hated Hillary.