The truth is that Obama was never nearly as free of dependence on big money donors as the reporting suggested, nor was his movement as bottom-up or people-centric as his marketing implied. And this is the big story of 2009, if you ask me, the meta-story of what did, and didn't happen, in the first year of Obama's administration. The people who voted for him weren't organized in any kind of new or powerful way, and the special interests--banks, energy companies, health interests, car-makers, the military-industrial complex--sat first at the table and wrote the menu. Myth met reality, and came up wanting.
Maybe that doesn't matter. But I suspect that it's not a great idea when the other side is highly motivated --- a state which anyone who has observed the right for very long could have predicted, Obama's pie-in-the-sky promises to end politics as we know it notwithstanding.
Now, there is a new enthusiasm gap, but it's no longer in Obama's favor. That's because you can't order volunteers to do anything--you have to motivate them, and Obama's compromises to almost every powers-that-be are tremendously demotivating.