Florida, Michigan, Obama and November

I have read and listened to various sources arguing that supporters of Sen. Clinton dissatisfied with the DNC's Florida and Michigan decision could tip those states in favour of Sen. McCain come general election, assuming Clinton has not Boss Tweeded the nomination away from its rightful owner by then. If Clinton supporters might actually jump en masse to McCain out of spite or genuine preference (although it's hard to imagine why a supporter of Clinton would prefer McCain over Sen. Obama, given that Obama's policy ideas are much nearer to Clinton's than McCain's), Obama's supporters could have serious cause for concern.

Florida has voted blue only four times in the past sixty years (excluding 2000), once each for Clinton, Carter, Johnson and Truman. Of Democratic presidents over that period, only Kennedy and Clinton (in his first term) won without Florida. Michigan is a stranger case, having voted Democratic for the past twenty years, Republican for the twenty years before that, and Republican three times, Democratic twice in the twenty year block before that. That adds up to solidly blue demographics in the short term but solidly purple in the post-WWII long term, with Republicans edging the Democrats by an 8-7 margin in the fifteen elections since 1948. McCain's famous appeal to independents may be hard for Obama to counter in a well-balanced state.