What I see in the RCP poll is Romney and McCain trading from each other. Maybe Huckabee picking up from Thompson.
Again,I think if Huckabee does very well in Iowa, you’ll see a lot of Romney support quickly evaporate. McCain will probably not do very well in Iowa, so his support goes somewhere else as well.
another Iowa poll out today with Huckabee doing very well
Below are the results of a three-day poll in the state of Iowa. Results are based on telephone interviews with 600 likely Republican cacus goers and 600 likely Democratic cacus goers, aged 18+, and conducted October 12-14, 2007. The margin of sampling error is ±4 percentage points.
http://www.strategicvision.biz/political/iowa_poll_101807.htm
Mitt Romney 27%; Rudy Giuliani 13%; Mike Huckabee 12%; Fred Thompson 10%; John McCain 5%; Sam Brownback 4%; Ron Paul 4%; Tom Tancredo 2%; Duncan Hunter 1%; Undecided 22%