You know the old joke. A family of Mormons and their Irish setter are on a road trip ... We might get to hear more of Willard Mitt Romney’s signature brand of knee-slapper if he accepts executive producer Lorne Michaels’s offer to appear on Saturday Night Live. The offer was reported by columnist Maureen Dowd in The New York Times, and Romney is reportedly mulling over the idea. While the Republican candidate is known for being more automaton than improviser, SNL’s Jim Downey said there have been some signs that Romney can rouse a lusty bout of applause over something other than the repeal of Obamacare. “He was funny on Letterman, giving the Top Ten list,” Downey told Dowd.