Ain't gonna happen.
Christie and Romney are both going to talk smack and bluff, but in the end, they will coalesce behind Jeb Bush. Because the powers-that-be that are yanking the Republican Party's chain is going to demand it; that there will no multiple RINOs running for POTUS so a conservative can push through.
I am thinking that Jebbie will be the nominee: there’s no stopping the liberal inevitable. But we don’s have to vote for him.
That is probably the case.