This could just be him distancing himself from blame from the batch of dems who are going to lose in 2010, so he can make a run for the presidency in 2012.
I have read in a number of stories he’s been considered by some on the left to be a presidential contender/material.
It would be perfect timing, he’s already said he’s pissed off at the current leadership (distancing) and isn’t running again (distancing, not risking losing) and has 13 million he sure as hell isn’t going to pump into the dems he thinks are losing big this election cycle, so he’s going to sit on that for his presidential run. Going up against Obama will be another act of distancing himself from what the loser dems and leadership are doing.
IIRC he considered running in 2008. Talk was Hillary talked him out of that race.