Probably Romney ...
Romney is a good candidate when the economy is bad (which was 2008), or so it was said.
But in late 2012, I think the US economy will be growing again by at least 2-3%.
And Romney is also a uncharismatic dog-abusing creep, with lots of money.
Huckabee is a Poor, McCain an Old and Palin a Retard ...
The GOP now has about 3 years to come up with a young, charismatic candidate with a coherent message who can raise 500 Mio. to 1 Bio. $ to challenge Obama. Otherwise Obama gets reelected.
Maybe Rick Perry should run ... ?
The problem is there isn't any young Repubican that could do that go toe-to-toe with Obama in 2012. Republicans really need to look at 2016, not 2012. Because unless Obama screws up very badly he will get re-elected.