Quote from AAAintheBeltway:
I'm not predicting that Dean wins or that he will propose a flat tax. I think both are very unlikely. What I do see is the following: Conservatives are not happy with Bush. The economic conservatives are wary of the increased spending, and Bush's failure to push for more dramatic tax cuts, eg eliminating cap gains. The cultural conservatives see an administration that has done nothing as the Ten Commandments are ripped off courthouses all over the country, that seems comfortable with affirmative action, that doesn't want to offend gays, that calls Islam the "religion of peace" and seems content to pander to hispanics and ignore illegal immigration.
Neither group will vote for Dean in meaningful numbers, no matter what he proposes. What they can very well do is stay home and sit out the election. That would not only cost Bush enough votes to lose, but would also be devastating for congressional races.
Part of their decision to sit it out will be based on Bush, but a large part is in Dean's control. if he appears to be a typical liberal airhead, the fear factor will drive conservatives to the polls. If he is somehow able to appear to be credible and even more desirable than Bush in some ways, eg flat tax, then he becomes a very real threat.
And I think Elliot spitzer would be impressive as a VP candidate. He would call huge attention to the administration's lax response to Wall Street and corporate corruption.