Bernie Sanders joked about Larry David's "Saturday Night Live" send-up of his unpolished image, pointing out on the campaign trail Sunday that he has "an ample supply of underwear." The Vermont senator told supporters in Iowa that he was a fan of David's impersonation, saying: "In terms of Larry David, I think we're going to put him up on the stage at our next rally ? let him do it rather than me. Mimicking Sanders, David said: "I'm the only candidate up here who's not a billionaire. I don't have a Super PAC, I don't have a backpack.