NEW YORK  —  After spending most of Saturday criticizing Hillary and Bill Clinton, Barack Obama took the stage with two impersonators — Amy Poehler and Darrell Hammond — on "Saturday Night Live."

The opening sketch of Saturday's broadcast featured Poehler and Hammond, as the Clintons, hosting a Halloween party. Toward the end of the sketch a man walked in wearing an Obama mask — which he removed to reveal he was, indeed, Obama.

"I have nothing to hide," Obama said. "I enjoy being myself. I'm not going to change who I am just because it's Halloween."

Campaigning in South Carolina earlier, Obama accused Hillary Clinton of giving voters "vague, calculated answers to suit the politics of the moment instead of clear, consistent principles about how you would lead America." And he subtly swiped at former President Bill Clinton by listing problems that "existed long before George Bush took office."

Obama wrapped up his brief late-night comedy stint with the show's signature line: "Live from New York, it's Saturday Night."