"They have no business using that name or referring to the temple," Hutchins said. "It's a very hurtful thing and creates a misleading impression in peoples' minds." Hutchins said he alerted Tagg Romney, one of Romney's sons, and church authorities about the mailings.

Romney's faith has been a recurring issue in South Carolina, where Christian conservatives dominate the GOP primary. Romney overcame some of those doubts this fall when he picked up an endorsement from Bob Jones, the chancellor of Greenville-based, Christian fundamentalist Bob Jones University.

Such a mailing isn't surprising for South Carolina politics, a state known for political mudslinging and backdoor maneuvering.

Those tactics backfire, said Warren Tompkins, a political consultant who ran George Bush's 2000 campaign in South Carolina and now is Romney's top consultant in the state. "Anything this outrageous and childish and nonsensical would have a significant fallout on whoever did it and on whose behalf it was done," Tompkins said.