Clinton - For the love of all that is just and holy, she should drop out of the race immediately and give a decent candidate a better chance. We need no war-hawks-in-disguise in the White House to kowtow to corporate interests even more than the others are likely to do. I won't even get into her other dubious qualities, as I'll probably get too upset to continue to function.
Dodd - Marry me!
Not likely to get many votes in the primaries, but certainly the best choice as far as competency, reliability, and morals are concerned. If he gets any degree of support in Iowa I will be as pleasantly surprised as humanly possible.
Edwards - I'm more-or-less ambivalent towards Edwards. He'd be fine, I suppose, but not thrilling in any degree.
Kucinich - The most likely "second-tier" candidate to garner sufficient support and one I would be happy to endorse personally. Kucinich is a man of principle and one who would not bow down to the Republicans in any way I can forsee.
Obama - At this point, probably the Dems' best hope. I'm not 100% behind him on everything and he's not as progressive as I would like, but he has a fresh vision of optimism and a desire for positive change, not to mention the public support that would be necessary to win the election (albeit much more would have to be thrown in between now and November).