Ahhh, the election markets -- very volatile tonight. As of right now, at Intrade, John McCain has just moved ahead of Romney and Rudy as the most likely GOP nominee.

If I were a betting man, which I'm not, I'd probably be putting my money on McCain too, though I would not be counting out Romney just yet. Not by a longshot. The Stepford Candidate is still very much in this. If Romney can hold on in Iowa, even a very embarrassing defeat (to McCain) in New Hampshire is survivable.

Rudy, not surprisingly, is dropping like a stone at both major prediction market sites.

And, as long we're chatting. We just put the finishing touches on the TPM Iowa Caucus Scoreboard. So we hope you'll join us tomorrow evening for live, up-to-the-minute and generally TPMified coverage of all the action until the last results are known.