I can tell you, as a Vermonter, that the "dry drunk" syndrome makes Dean a very angry guy. He's often on the edge of exploding, of course always in the name of some righteous cause. I don't think he'd be able to keep it under control in a long campaign should he be the Dem candidate.
According to Dean's biography, he got his medical degree in 1978, and he's been in politics since 1982, when he got elected to the Vermont statehouse.
This means a couple of things: number one, this guy was only actually a practicing medical doctor for about four years or so. Second of all, if he didn't quit drinking until 1981, this means that he was a drunk for a significant portion of the time he was actually a practicing medical doctor!
Yeah, this is a guy that should be President of the United States (eyeballs rolling up to the ceiling).