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On James O'Keefe's latest video

Video trickster James O'Keefe has posted a video showing a man walking into a Washington, DC polling place last Tuesday during the local primary and claiming to be Eric Holder.

In the video, the man gives Holder's name and address (which is bleeped out). The poll worker asks the man to sign the voter sheet, but the man says he has left his ID in the car. "You don’t need it," the poll worker says. "It’s all right. As long as you’re in here, you’re on our list, and that’s who you say you are, you’re okay."

The man declines to sign, says he's going to get his ID, and leaves.

O'Keefe's group, Project Veritas, offers the video to rebut Attorney General Eric Holder's position that there's little evidence of in-person voter fraud to justify changing state laws to require government issued photo IDs at the polls. The video includes excerpts from a recent NBC News interview with Holder on the subject.

In response, a Justice Department official says "about the only time we get concrete evidence of voter fraud is when someone pulls a stunt like this."

By the way, a federal official says the man in the video did not commit voter fraud, because he never signed the voter sheet and -- therefore -- never received or cast a fraudulently obtained ballot.