It will be Graham or Clark most likely. Both have strengths and weaknesses.
I agree Dean cares about Dean, not the future of the party. He is running vs the party now and blasting Terry McAuliffe and calling DLC Democrats Republicans.
It all comes down to a question of saving face now. I think there is too much bad blood between Dean and Clark, so Dean will most likely turn to Graham as his choice in order to not be eclipsed.
As for Terry McAuliffe and the DLC Dems, I like to refer to them as nothing but Diet Republicans (whether that be a good thing or not is a matter of perspective I guess)