yes, and they show that the people with no form of ID are .015% of the population.
So we should accept the ability to commit voter fraud in exchange for possible disenfranchisement of a few thousand people who probably would not vote if they had an ID.
Even if the numbers are that small, thats too large a number to justify photo ID requirements for registered voters who have already proven who they are when they registered, given the fact there is virtually no voting fraud occurring as a result of voter impersonation:
The most widespread hurdle has been the demand for photo identification at the polls, a departure from the longstanding practice of using voters signatures or household identification like a utility bill. Seven states this year have passed laws requiring strict photo ID to vote, and similar measures were introduced in 27 other states. More than 21 million citizens 11 percent of the population do not have government ID cards. Many of them are poor, or elderly, or black and Hispanic and could have a hard time navigating the bureaucracy to get a card.
http://www.nytimes.com/2011/10/10/opinion/the-myth-of-voter-fraud.html
In Wisconsin, for example, the frequency of voter fraud was mere .0007 percent of total ballots cast, again, virtually non-existent.
Voter photo ID laws are nothing more than a partisan contrivance by the right, a bad faith attempt to discourage voting by those perceived by conservatives to be democratic voters.