Schnapper said he's worked on Republican and Democratic campaigns and has paid people to hand out leaflets or register voters.

CNN: Ex-ACORN worker: 'I paid the price' for voter registration fraud

But University of Washington law professor Eric Schnapper says the idea of fake cards turning into real votes is a myth.

CNN: Ex-ACORN worker: 'I paid the price' for voter registration fraud

"There are no known instances of fictitious people actually voting, " Schnapper said.

CNN: Ex-ACORN worker: 'I paid the price' for voter registration fraud