Howard Dean is the chair of the DNC.
http://en.wikipedia.org/wiki/Howard_DeanHe is marginalized by Lieberman. Lieberman actively works against the party. He covers up Bush's crimes. Using the media to help.
http://lieberman.senate.gov/newsroom/release.cfm?id=245208He initiated a whitewash of the Katrina horror under the cover of a bi-partisan investigation. Bi-partisan from this Congress. No one can believe he is sincere on that. He is a traitor.
Why doesn't the DNC support someone else for Lieberman's seat?
It seems like a simple question. I don't know why is so difficult to express.