Before you dismiss me, consider this. If you know anything about politics, you'll know that the one thing that moves a politician more to listening to his/her base is a primary threat. Obama is free to ignore us progressives because he [believes] he has nothing to lose because of it - we need to show that his decisions have consequences politically.
What i'm saying is, its a win-win for us to do this. Either we succeed and we get a stronger progressive in the white house in 2012, or we fail, but Obama becomes more of a progressive president.
Names to consider for 2012: Anthony Weiner, Alan Grayson, Dennis Kucinich, Bernie Sanders, Russ Feingold, Howard Dean....