What factors motivate people to make it to the polls in any given year, and what keeps them away? One thing we learned from 2016 is that predicting not only how people will vote, but if they will vote, is extremely complicated. How much impact do positive or negative ads on TV or social media have on voting rates? How and where will gerrymandering, or redistricting, be most consequential? How much impact do things like voter suppression, inaccurate voter rolls, and voter fraud really have on the integrity of our elections?