The ACLU has a nice blog post about the history of vote fraud in this country. It's short and to the point. It reminds me of something I had forgotten: there are no almost no documented cases of someone trying to impersonate someone else in order to be able to vote. Which is another useful reminder that photo ID laws are a solution in search of a problem.
Still, I can see the logic behind photo ID laws, and I can see some value in them, if only to increase most voters' comfort level with the integrity of elections. So I am still interested in the idea of liberals endorsing photo ID laws with the proper safeguards to insure that everyone who deserves a photo ID can get one very easily.