"I don't want to give it away, but he just kind of has a small moment and [Leslie] doesn't know he's there," Poehler says of her scene with McCain. "So it's kind of funny because she's having a moment and he kind of walks through, and she doesn't really know who she's talking to."

So is Poehler looking for Sarah Palin or Mitt Romney for the show's next Republican politico guest star?

"No, I don't think we're going to do any more D.C. cameos as of yet," she smiled. "We got Senator Barbara Boxer and Senator Olympia Snowe, and there's a few other juicies on the way."