Washington (CNN) - House Democratic Leader Nancy Pelosi has been a fixture on the GOP presidential campaign trail of late, but not of her own accord.
Newt Gingrich - a former House speaker - and Pelosi - then the speaker - appeared side-by-side in a climate change commercial; Gingrich now says, "the dumbest thing I've done in the last four years was sit on a couch with Nancy Pelosi."
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In a Tuesday interview on CNN's "John King, USA," Pelosi pushed back sharply against his characterization of the episode.
"I think he's done plenty of dumb things and there's stiff competition for what is the dumbest thing he's done, of course, including his violations of the ethics rules of the House of Representatives," she said.
Pelosi said the ethics charges against Gingrich were not a "Democratic vendetta," but she declined to comment further, saying "the public record speaks for itself."
And a Gingrich presidency, she said, is not a reality she expects to see.
"He's not going to be President of the United States," she said. "That's not going to happen. Let me just make my prediction and stand by it: that is not going to happen."