If Clark doesn't pick up either Oklahoma or Arizona next Tuesday, he's finished. Heck, he's probably finished anyway.
Edwards should have enough momentum to carry him through to the convention, but I don't know that he will have the appeal to win the nomination. But the Democrats need a Southerner to win the White House - not since JFK has a non-Southern Democrat won the Presidency, and JFK didn't even get the majority of the vote.
Lieberman is dead in the water and is siphoning money from everyone else. The only way he could resurrect his campaign is by winning at least two states on Super Tuesday.
Dean is certainly not out yet. He's got a lot of Angry Liberal states out there still - including California, with the wackiest libs of them all.
Kerry is now the obvious front-runner. I don't think it will take long for the sights of the other four to target in on him. The race, as it stands now, is his to lose.