The campaign made the mistake of not CONFIRMING the endorsement with Conyers before running with it.
I'm a Dean guy all the way, but it was incidents like this that hinted at some of the immaturity in the Dean organization.
"As I have previously stated, it is clear to me that the governor, if nominated, would be a very strong candidate against George W. Bush. As I also have stated in the past, I do not plan to formally endorse a candidate for president until shortly before the Michigan caucuses."
Conyers said he "has no doubt ... that Howard Dean has run the best and strongest campaign among the Democratic candidates." Edwards in the workplace
It was Conyers who jumped his own gun and then bcaktracked.
"It is time for the party to choose a new Chairman, and I believe you are the best candidates to pick up the torch and take the Party to a new level of success."
Hopefully, they will elaborate. But suffice it to say, there was a kind of endorsement, and then some quick work from those with better connections not only got an un-endorsement, but made sure the press heard about the un-endorsement.
And yes, it was a sign of Dean's immaturity, and his supporters' (and I too count myself as one) lack of experience with the local pols.