Just remember, write in is not the same thing as 3rd party candidate. I will not vote for a 3rd party candidate; however; I am all for writing in and I believe enough people out there are so against John McCain; they would do this. Or participate in some viable method to bring Hunter back on board.
As much as I dislike the false belief that we have two party system, I do agree that 3rd party runs are political suicide. (at least right now)