The really poor in the US don't tend to have ID. They often can't afford to take the time off work to go through the process of obtaining it, especially if they don't drive. Additionally, it's an extra expense some people can't afford.

Also, voter fraud isn't much of an issue in the US, so it's a solution to a problem we don't really have.

Sometimes I wish those crying voter suppression would amend voter ID proposals to make getting ID free and easy and just put this whole issue to bed. Unfortunately with REAL ID, things are only going to get more difficult and expensive.