I think it did happen, and in fact, there were a lot of posters on the Freerepublic who were very vocal in making the point that they would do just that.
The Evangelicals showed up and they voted 79% for Romney, so it sure wasn’t them, Romney just couldn’t win over people like moderates and disgruntled Obama voters from 2008.
Romney has always been a loser in campaigns, 2012 was just typical Romney results.