In an interview with CBS News, Mitt Romney explained that he didn't mean to jab the president when he told a crowd today, "No one’s ever asked to see my birth certificate."

CBS Evening News anchor Scott Pelley asked why Romney took a "swipe" at President Obama by referring to "birther" rumors. 

"No, no, not a swipe," Romney responded. "I've said throughout the campaign and before, there's no question about where he was born. He was born in the U.S. This was fun about us, and coming home. And humor, you know -- we've got to have a little humor in a campaign."

Obama campaign spokesman Ben LaBolt said earlier Friday that the joke was Romney's way of embracing "the most strident voices in his party instead of standing up to them."