He will run, lose, and then attack the GOP for being too extremist and directed by the far right. John only wants to wreck the party to advance himself. I'll never vote for him because I think he is nuts, honestly, I think he is crazy and dangerous.
Same shit he pulled when W handed him his ass back in the 2000 primaries. And he will get his ass handed to him again. Some people learn from history. Others don't and are doomed to repeat it. McCain is in the latter bunch.