I agree with Towney that Hillary's appeal is largely exaggerated. Maybe she's popular in New York but I think in the rest of the country she is viewed as a shifty politician by liberals and anathema to conservatives. But she does have a powerful cmpaign machine and may bulldoze the other potentials with it and her standing in the "Democratic Leadership"(a force I'd like to see toppled from the Democratic Party).
I haven't really looked into Vilsak or Richardson yet. I think Obama might surprise people if he thinks as much as he talks... but I still don't think he has a shot. If Hillary's money doesn't destroy him, the mudslinging will (He's already shown that he can't take it and that could prove fatal over time).
But I don't think Hillary can win, so I hope the Crat Leaders pull their heads out and think about it. If Giulliani wins the Pub candidacy, it's over for Clinton. Chances are if McCain or possibly even Romney wins, a lot of Crats and moderates will prefer to vote Republican. Even I would, unless some real far-right loon wins the candidacy. Because no matter what Hillary says, we already know from experience it means very little. Her views are like the weather in Michigan. Normally I like it when candidates are flexible and able to change their minds... but it seems to me she does it far too transparently for purely political reasons.
I'll have to look into this Richardson guy.

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"Man lives in the sunlit world of that which he believes to be reality. But unseen by most is an underworld, a place that is just as real... but not as brightly lit... A DARK SIDE!"
-opening from Tales From the Darkside