I pretty much agree with most of what you said there, though.

I would also add that, as much as Democratic "disenfranchisement" arguments disgust me, the linked video in this original post is probably conveniently ignoring one very important proof of identity: the person's signature. If DC is anything like New York, what that person was asking him to do in order to get a ballot was sign the book. Since a copy of the signature is already there, printed out, the person would then compare the two signatures. If they weren't similar, the person at the polling site would likely report potential voter fraud (and the guy in the video would have just shot the evidence needed to put him in jail).

As a result, you need to know the name, the address and be able to fake the signature of the person you're trying to vote for. Not impossible for some, but a lot harder than it looks and certainly not something that crazy homeless people are going to be able to accomplish.

In short, though, free ID cards = solution.