Several states adopted new laws last year requiring that people show a photo ID when they come to vote even though the kind of election fraud that the laws are intended to stamp out is rare. Even supporters of the new laws are hard pressed to come up with large numbers of cases in which someone tried to vote under a false identify.

"I've compared this to the snake oil salesman. You got a cold? I got snake oil. Your foot aches? I got snake oil," said election law expert Justin Levitt, who wrote "The Truth About Voter Fraud" for The Brennan Center for Justice. "It doesn't seem to matter what the problem is, (voter) ID is being sold as the solution to a whole bunch of things it can't possibly solve."

Kansas, South Carolina, Tennessee, Texas and Wisconsin have passed laws this year that allow voters without the required photo ID to cast provisional ballots, but the voters must return to a specific location with that ID within a certain time limit for their ballots to count.

Indiana and Georgia already had such laws. Other states have photo ID laws too, but provide different way to verify a voter's identity without a photo ID. Texas and South Carolina are awaiting approval for their laws from the Justice Department because of those are among that states with a history of voting rights suppression and discrimination.

Indiana's law, passed in 2005, was upheld by the U.S. Supreme Court in 2008. Levitt combed through 250 cases of alleged election law fraud cited in legal briefs filed in that challenge. He found only nine instances involving a person allegedly voting in someone else's name, possibly fraudulently or possibly because of an error when the person signed in at the voting booth.

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