Guys, Romney was a bad candidate four years ago and would still be a bad candidate today. Just remember, at points he was losing to: Rick Perry, Herman Cain, Newt Gingrich, and Rick Santorum. Two of those people can't even crack the top 10 in this field, one was pushed out of the Speakership by his own party, and the other rose up by saying 9-9-9 about twenty times a day.
Romney's always been overrated as a candidate. The GOP renominating a loser when it has younger rising stars to pick from would look especially asinine.