Many efforts to increase youth voting focus on getting young people registered. That’s a crucial component to driving electoral engagement, but it’s only half the battle; we need to ensure that registered youth actually go out and cast a ballot on Election Day. In 2016, nearly six million young people (ages 18-29) were “undermobilized”—meaning they were registered but did not vote. The problem of undermobilization is even more acute in midterm elections: 12.5 million registered yout...