Matt Stoller has a very important post on the way in which Obama is changing the Democratic Party, and creating a new, centralized power structure that's much more powerful and vibrant than anything we've seen previously, but also entirely dependent on, and controlled by, the person of Barack Obama. And it's en route to creating a majority that's centered around a particular individual in a particular moment with a particular message -- not a party, and not a set of policies. This creates some enormous opportunities for progressives, but also some real dangers. I'm doing a lot of thinking along these lines, but am not quite ready to tip my hand on conclusions. For now, though, read Matt.