@JPB,
Ryan is a Congresscritter, and he does not have the fire in his belly, so that is two strikes against him. He would be a very long shot.
Christie looks like he will have a heart attack any minute, and he was just in the hospital with a scare,so there is no way he can win.
The candidate either needs to come from the states or the military, with an outside shot for a businessman. I think someone should give SEC Gates a call ...
For those who have not noticed...Congress has an approval rating of 13% today. As Chris Mathews said today Idi Amin probably had a higher approval rating than does Congress.