I think they will vote at the Repub convention and not select a nominee, so they will vote a second time and not nominate anyone. Before the third vote, a new guy will show up and everybody will immediately jump on the bandwagon for this new Republican-du Jour and that's who will be nominated. I can't figure out if it's likely to be Palin or Jeb Bush or Rush or somebody else, but it's going to be someone who falls out of favor just as fast as all the previous momentarily popular republicans... but they'll be stuck with their choice.