This is yet another hurdle over which voters will have to jump, which is in direct violation of every citizen's right to vote. Voter suppression is subtle and may seem reasonable on the surface, but it's voter suppression nonetheless. How many people are going to remember to bring their passport to their voting precinct? How many people even have a passport in the first place? What about green cards: do people carry those around with them everywhere? Probably not. This would make things more difficult, specifically for demographics that traditionally lean left.