After Mitt Romney cracked a birther joke at a rally in Michigan, he explained himself to CBS:
"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."
Alex Halperin is news editor at Salon. You can follow him on Twitter @alexhalperin.