It's despicable when Republicans try to intimate Barack Obama is a Marxist Kenyan Muslim to gin up votes. It's equally despicable for Democrats to paint Romney as some kind of polygamist cult member.
Obama himself has never said anything about Mormonism and the campaign has specifically stated Romney's religion should be off limits in the campaign, as recently as today. Romney himself has said Obama was seeking to make America less Christian. So there you have it.
But as a non-Christian I'm sure Romney think that's a good thing.