Why He Won

I don't see how Bush fucking up has anything to do, per se with Obama getting elected.
In my mind, Obama got elected by running a near-flawless campaign. He leveraged Howard Dean's groundbreaking work in terms of organizing and fund raising. He recognized that in genuinely troubled times, overt and reactive partisanship wasn't the right prescription. Overall, he had a winning strategy from the outset, and stuck to it. One of the bobbleheads I heard last night coughed up a truism: most battles are over before the first shot is fired.
Obama's victory is akin to Bill Clinton jumping into the fray in 1991, when all the Democrat bigshots were bailing -- refusing to be cannon fodder before an a triumphant GHW Bush's inevitable landslide. Clinton (and his team) sensed something different and developed the plan to capitalize on it, and it worked. In the face of obstacles and stupidity, their hand stayed firm. It was the plan that won.