If the Democrats support him — rather than their own nominee — then I suppose he might have a shot. But he’s not getting in with Republican votes. He won’t have nearly enough of those.
The newly-elected Republican state legislative bodies had better change the primary rules NOW, so that only registered Republicans can vote. No more of these loosey-goosey, let anyone vote on Primary Day - that's one of the things that got us Juan McInsane as the '08 candidate.