"Opponents of the law contend it discourages some people from voting, including the elderly, poor and disadvantaged who don't always carry IDs. "
"The very people that tend to vote in much lower numbers anyway."
I have never met a senior citizen who does not have a photo ID. As far as the poor, most states have photo ids available at the motor vehicle, or town halls, for fee or a couple dollars. A lot of states require them for welfare recipients.
Those are just a couple of examples that cover people who do not have drivers licenses.
Here in Arizona, the Motor Vehicle Department gave my elderly mother a picture ID for free!