Teachers get out plenty early, eh? Guess you don't know many teachers, Legregius. I have in fact, more than once, found it challenging to get to the polls. I have always managed, but you seem to rely on the assumption that all teacher leave at the contracted time. I have known maybe two teachers who commonly achieve that.
I also find entertaining (and offensive) the implication that we teachers exist to babysit the children of America. Yes, I know that for many people it is very, very hard to get off work, and I have sympathy, but I also find it absurd that in our society we make decisions about what is best for learning based on what is convenient (from this kind of issue to sports programs). It's insane, really.
In any case, I think a federal holiday for Election Day would be appropriate--that or (and?) providing time for voting beyond a single day. Most likely won't ever happen in America but it's a damned fine idea.