re: Other than McCain's former advisor?
Okay, counting Weaver and Buckley, that's what, five? I found two more, but you never would have heard of them.
I know there's a squadron of Obama's news reporters out there digging up disaffected Republicans. You could probably come up with as many as ten quite easily. I bet fifteen would make you sweat, and most of those would be unknowns.
You can't expand this into a major party movement any more than you can expand a few kooks into a raving mob.