Hell, it's not like they don't have an ID, or couldn't get one. Free even.
If someone is that much not a part of society, what's the realistic chances that they would actually, like vote?
A simple ID at the voting polls would help avoid this from happening.
Hell, the law already states (Patriot Act) that everyone must have a picture ID to present when asked by law enforcement. So to keep in line with the law, everyone is supposed to already have the ID. How much of a stretch is it to ask for the same ID when voting?
Know the truth and the truth will make you mad, because the truth has no agenda.
As they used to say in Chicago, "Vote early. Vote often."