Bill (Darrell Hammond) was dressed as Mystery from VH1's "The Pickup Artist," while Hillary (Amy Poehler) wore a bridal gown that all the guests referred to as a "witch costume."
A man showed up wearing a Barack Obama mask who turned out to be Barack Obama himself. "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."
Obama then delivered the famous opening line, "Live from New York, it's Saturday night!"
Watch the video clip, read the New York Times article about Obama's late-night coup, plus check out more funny moments from the 2008 campaign trail.
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