I think Jeb will run, and if Jeb runs I don't think Mitt will.
Paul Ryan is a legislator and an animal of the House... if Scott Walker runs, which I think he will... Ryan will not run.
I like Rand Paul alot. He has a problem... if he runs he has to give up his Senate seat. I think he will run, but he'll have trouble.
He has a strong Libertarian streak and many of the base are afraid of pulling the plug on influence of the world stage.
Chris Cristie should have run in 2012 when we needed him. I think his time has passed and he'll be easily painted as a bully.
Ted Cruz is too Tea Party for the general... he's a lawyer and can't shake that "win at all cost" attitude, but I love his conviction.
Rick Perry will run again but will have trouble shaking off his horrible performance in 2012 debates. Governors make the best Presidents, so they always have an advantage with Republicans. Perry should not have run in 2012.
Rick Santorum will run again but that's a loser from the gun... his entire platform is social conservative and that can't win anymore.
Ben Carson will test the water, but he has no political or governing experience and the guys above, will kill him with it.
Watch out for my Governor here in Nevada... Brian Sandoval won re-election last night with 71% of the vote. A former Federal Judge, he is hispanic, very likeable, brilliant, and a great Republican. He would be a good President... but unknown so far.
Brian Sandoval looks like a decent guy, but don't you think being pro-choice and the first Republican governor to have expanded Medicaid under the ACA will doom him in the primaries?
But if he makes it past the primaries, he'll probably be hugely popular with the middle.
Also, the more you run, the less likely you are to succeed, so being unknown would also help, provided he has good campaign staff.