I still would think that Dean would appeal most to Libertarians out of the Democratic group. Here is why I think that is:
1. He favors state's rights on gun control.
2. He demands that the federal budget always be balanced.
3. His stance on civil unions and gay rights: the government staying out of people's personal lives.
4. He favors repealing the Patriot Act.
Because of these libertarian ideals, I think Dean is not only the most qualified but the most electable of the Democratic crop. Check him out.
http://www.deanforamerica.com