Funny you should mention. I just happen to have written a little something about how researchers are developing algorithms that give the courts hard proof of voter ID laws' racially discriminatory impact. wired.com/story/voter-id…
The most promising among them can accurately match people in the voter roll to voter ID databases with the same accuracy as a Social Security Number. wired.com/story/voter-id…
This means courts now have something more accurate than a survey to show who does and does not have adequate identification once and for all. Surprise: black registered voters are far less likely to exist in those ID databases. wired.com/story/voter-id… 
The only teeny tiny sliver of an upside is that a very small percentage of registered voters overall lack adequate ID, but even that small percentage can mean hundreds of thousands of possible voters being disenfranchised. wired.com/story/voter-id…
