so much for sneaking Romney or Ryan in there...
Not so fast - Romney was rushed out of nowhere to be the voice of reason for the right. I couldn't figure out "why him?", until you asked me the question.
He never took the pledge, so they could run Romney as a moderate third party candidate with the sole purpose of preventing Hillary or Trump from getting to 270 (mind you, I don't think it would work, but it does explain why he came out of nowhere to be on the front pages against Trump). Then the House could elect him.