Who is most likely to beat Obama?

[Yelnoc]

Mitch Daniels.  He's the only non-loony who could be a serious candidate, plus he has a strong record as a two-term Governor of Indiana and has the connections that would allow him to run a well-financed campaign.

[Yelnoc]

Your just highlighted the Republicans' biggest problem with 2012--all their A-list candidates are relatively new to the job.  McDonnell or Christie would each be excellent Presidential candidates if we could fastforward 4 years to where they would have more than a year in office before running again.

Neither Mitch Daniels nor John Thune have this problem.  They are also not one of the "Four Horsemen" that SPC pointed out each have major flaws that would prevent them from winning the election.