Going by the quote from Dean that katlaughing provides, I don't see any mention of an endorsement. "Support" doesn't necessarily equal endorsement.

I think Dean's machine would better serve the party if he uses it to truly transform the party, rather than just hand over the donor mailing list Kerry for the November election.

Bush is in the White House because of the failings of the Democratic party. The party needs to be transformed, or get use to irrelevance as the party out of power, which is what it is now.