Don't buy into the Media hype. McCain won South Carolina tonight with a whopping 33% of the vote - That means that 67% voted against him.
Of course 84% voted against my candidate, whom I will write in if he isn't on the ballot as well. Which really translates into I am no longer supporting the Republican party, at least for this election for President. But you shouldn't give up so easily if you are "for" Romney based upon principle.
If you are going to write in someone who isn’t running for President (as I can guarantee you Fred Thompson will NOT be doing if he doesn’t win our nomination), why not write in Ronald Reagan? He’s not running either but he’s a true conservative in the mold of Ronald Reagan, and has as much change of winning as anybody else you write in.