Voter Group Admits Mistakes, Defends Work

Dan Tokaji, an election law expert at Moritz College of Law, said, "You'd have to be a complete idiot. It's high risk, low reward."

Tokaji says that voter fraud is "rare" and that Republicans are "trying to use the ACORN story" to raise fears of fraud and "make it more difficult for people to vote."

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But Heather Heidelbaugh, a Republican lawyer based out of Pennsylvania, says that Democrats often limit the definition of voter fraud to voter impersonation. "The broader definition of voter fraud includes voter registration and absentee ballots."

"I don't think voter impersonation is a rampant problem," she said. "It would be very difficult to walk into a voting place and impersonate someone." But she says that it bothers her when people say voter fraud doesn't exist.

"I bristle when I hear that it doesn't exist," she said. "If ACORN or groups like them flood election division offices with thousands of fraudulent registrations, each one of them has to be checked and it means the chances are that a valid registration won't be processed because of time restraints. Therefore the legitimate voter would be denied the ability to vote."

ABC News' Jake Tapper and Teddy Davis contributed to this report.