Yea, then you have to cream Obama in several debates running, and out of the pack of Republicans running only Romney, Newt, and Cain are capable of doing that. And Palin if she runs has already proved herself when she went up against Biden. Those are the four names that can do it, like them or not.
Perry? Not a chance, sorry.
And except for the 2nd tier Cain, Bachman and Santorum, they are all RINOs in one way or another.