I'm surprised Thune is in 3rd place. Newt won't run no matter what anyone thinks, he has too many personal issues and used to be known more for being jerkish than an executive leader. Thune is a future leader but he is very green, like Obama was in 2008, so Thune will need a lot of breaks to beat the more campaign experienced and leadership in Romney.
I think there is more appeal for a 2-term Governor like Huckabee in 2008, so Daniels has a chance but he doesn't want to run. T-Paw is good but very boring. There are some other 2-term governors and I think they have a likelier chance of beating Romney and Palin (who won't run) for the nomination.
Newt is running. The campaign is already in the works