Critics say Rep. Jim Moran (D-Va.) is known for being outspoken and for occasionally making remarks that land him in hot water.
"If the Republicans were running in Afghanistan," he said, "they'd be running on the Taliban ticket, as far as I can see."
McDonnell spokesperson Crystal Cameron called the remark "negative" and "vicious."
She said Moran is trying to drive up turnout among liberal voters who are unenthusiastic about Democratic candidate Creigh Deeds.
"Creigh has had a very difficult time rallying his base," Cameron said, "and they're trying to do anything they can to get out the vote on their side."
Polls open in Virginia on Tuesday morning.
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