Romney and McCain are not likely to share a ticket. I think Giuliani and McCain might want to share a ticket, but I'm not sure if it will actually happen. If McCain gets the nomination, his biggest problem will be that he doesn't really appeal to the more conservative Republican base. Neither does Giuliani. So I think he would try to pick someone who might add some balance to the ticket and bring in someone who would appeal more to conservatives. Although, McCain is a sort of a maverick and may ditch the idea of balance and go for whoever he wants. Who knows? This has been a wild race so far!