Yeah, it's a good one. They argue that it is because poor people cannot make their way to the government office to get an ID, thus it is discriminating against them because they don't have a car. Of course this is assuming that because they don't have a car or mode of transportation, that they have no part in not having a car. That in fact, they are entitled to have transportation even if their previous behavior may prevent them from having transportation. Thus voter ID's are discriminating against the poor because they have a tougher time going to get one irregardless of the reason. Mind you, part of the reason why the original founders required land ownership to vote, is to avoid this type of argument.