And of course that description disproportionately applies to the less well-off and less well-educated, which in turn disproportionately includes minorities.

Of course, I personally think requiring photo ID to vote is a no-brainer, but then that's because I'm used to it (incidentally, I'm also used to voting being compulsory, but that's neither here nor there); when you go from not requiring it to requiring it, it means an extra hurdle before you can vote, and any extra hurdle is likely to make a certain number of people say "oh well, I won't bother then". Of course that's their own choice, so it doesn't actually disenfranchise anyone in the strict sense of the word.