In hypothetical 2012 head-to-head matchups, Romney is the only Republican to defeat Obama in this latest poll from Quinnipac:
Romney--45
Obama--44
Palin--40
Obama--48
Huckabee--44
Obama--46
Mitch Daniels--36
Obama--45
Also, the GOP nomination voting goes like this:
Palin--19%
Romney--18%
Huckabee--17%
Gingrich--15%
Pawlenty--6%
Daniels--2%
Barbour--2%
Thune--2%
Interestingly, Romney carries men, people with a college degree, and Catholics; Palin carries women and people without a college degree; Huckabee carries white Evangelicals and Protestants.