The latest Rasmussen poll shows Herman Cain leading Mitt Romney by 7 points among likely Iowa caucusgoers. Recent polls by PPP and Insider Advantage have shown Cain leading Romney by a similar margin.
As for the rest of the field, Rasmussen shows Ron Paul at 10%, Newt Gingrich at 9%, Iowa straw poll winner Michele Bachmann at 8%, and Rick Perry at 7%.
On this day in 2007, the RealClearPolitics average of polls showed Romney leading in Iowa at 25.3%, with Fred Thompson in second place at 15.3% and Rudy Giuliani in third place at 14.5%. Eventual Iowa caucus winner Mike Huckabee was polling at 11.8%.
In other words, a lot can change in 10 weeks.