Do pple forget that McCain was ahead in the state as recently as Spring 08?
Do people forget that in Spring 08 the Democratic primary battle was still going strong and many Clinton voters were still claiming they'd jump ship if she wasn't the nominee? Perhaps they also forgot Obama did virtually no campaigning there until after the primary was completely over since he wasn't on the Michigan primary ballot.
Seriously though, I don't see how the Michigan voters are going to turn against the Democrats when the Democrats are still so pro-union and they just bailed out the state's biggest industry. Unless Obama makes driving a car illegal he's going to win Michigan.