....assuming he makes it past the GOP convention.
He is too precious of a gift to throw away too soon.
We're going to expend all our ammunition against him then Romney (or someone else) will sweep in as the sane choice.
Boom. The game changes.
And if there is any move to replace him at the convention, it will only result in a huge commotion on the floor that will damage the GOP even more. He's the nominee and that won't change.