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“[Mrs. Pelosi] cast herself and her minions as America’s political clean-up crew. But once again, the culture of corruption boomerang has swung back around to smack Democrats in their smug mugs,” said Ms. Malkin. “The cynical Swamp Drainers just hope you forget it all by election time. Don’t.”

Democrats counter that Republicans have had their own share of recent scandals, including the federal indictment of former Virginia Gov. Bob McDonnell and his wife, Maureen, who are accused of accepting illegal gifts.

Although Mr. McDonnell is the higher-profile figure, he has been overwhelmed by the sheer number of Democratic local and state officials facing corruption accusations. Examples include the corruption conviction in January of former New Orleans Mayor C. Ray Nagin and the bribery conviction in February of former Trenton, N.J., Mayor Tony Mack.

Republican strategist Dick Wadhams said the corruption scandals could hurt Democrats in state and local elections, especially in the vicinity of the accused wrongdoers.

“I think it hurts Democrats in the jurisdictions where these elected officials come from,” said Mr. Wadhams. “The preponderance of the incidents is certainly not news for the Democrats across the country, but I would say it would have more of a local effect.”

He added that the scandals may be a byproduct of California’s Democratic Party dominance.

“When you consolidate power in one party, this is what happens,” Mr. Wadhams said.