Gov. Mitt Romney (search) traded off-color barbs with fellow politicians at a roast Sunday, even throwing his Mormon heritage into a one-liner about gay marriage (search), which he opposes.

"I have to admit that as a Mormon, I believe that marriage should be between a man and a woman ... and a woman and a woman," he said.

The legalization of gay marriage here was among the fodder for the popular St. Patrick's Day (search) breakfast in South Boston. Romney's out-of-state travels and rumored 2008 presidential aspirations also provided gags.

House Speaker Salvatore DiMasi (search) asked Romney if he'd had trouble finding his way from the airport.

"Are those tickets in your pocket?" DiMasi asked. "I don't want to keep you too long. You can leave any time you want."

Romney responded: "I'll be here 'til you get funny."

The roast is the more than half-century old precursor to the annual South Boston St. Patrick's Day Parade, which draws hundreds of thousands.