Polling places aren't open during a plurality of hours in which people who work irregular hours can vote -- the Alabama example above affected me personally but generally is true in most of the southeastern United States. We don't get the day off, there isn't a means of transport unless you already live in a city that provides "rides to the polls," and lines are often long and slow to move.

I'm not saying that to deride your instinct here that a polling place being a private booth is kind of Cool™, just that providing accessibility (or, if I had my druthers, making voting _mandatory_ and giving everyone the day off to do it) sometimes requires we open the idea book and consider how we can make sure everyone who has the right to vote can do it.