After hearing some of the usual right wing nonsense, I'd love to see Obama call a press conference and say something like:
"I want to make it clear that I have no ill feelings towards the Mormon faith, and in fact I hold it in very high regard. Mormons have been loyal and upstanding citizens of our great nation for generations. One of the few things about Mr. Romney I have respect for is his Mormon faith. And he holds a high position in that church's hierarachy, which is something I would proudly proclaim if I were him. Anyone who thinks that Mr. Romney's Mormonism is a reason to vote against him might want to read the U.S. Constitution and ask themselves if they can do better than our Founding Fathers, some of whom were Deists. I have a great deal of respect for all of them, even though they didn't all share my Christian faith. We all should show the same respect for Mr. Romney's Mormonism."
In this way, Obama will make it clear that he will keep saying this kind of thing whenever right wingers bring up a religious issue, and I have no doubt this is the last thing they want Obama to say in this context.