The only Republican nominee I would even consider voting over Hillary would be Ben Carson and that one cat who did the 'I'm the Bluecollar guy' shtick (he might actually be).
Carson, because I really don't know anything about him thus far, so I can't rule him out on that merit alone.
The other guy because he seemed very down to earth and progressive. He's the one that basically said "sure I have my own beliefs, but the law is the law and we need to accept and move on to more important things" in regards to the same-sex marriage question. But again, I'd need to know more about him.