And who else?

Everyone, actually:

Under current laws, many Americans need to present some form of identification to register to vote. The act would require Americans show additional documents that prove their citizenship, such as a passport or a birth certificate.

You just moved? This little errand, updating your voting registration, just got a little more complicated, a little more likely to be a problem. Or a lot more likely, if you lost your birth certificate in the move somehow. Or if you don’t have the kind of settled life where you’ve got a file cabinet for these documents the government expects you to curate on their behalf.