(Marisa Wojcik/The Eau Claire Leader-Telegram via AP) Marlys Leary of Eau Claire, Wisconsin, hands her photo identification card to an election assistant on March 21, 2016. A question—one of the many—hanging over the 2016 election is the impact of state laws and administrative techniques designed to make it more difficult for people to vote. How were people affected, and to what degree did these practices alter the election’s outcome? And what is going to happen in 2018, as a national administration committed to depressing the right to vote works with state allies? Next year is an off-year election when factors influencing turnout, even marginally, could be crucial. Conversely, what forms of resistance are already occurring, and how effective will they be in protecting and expanding the franchise? In 2016, other factors affecting turnout included the Russian hacking, the Comey interventions, the enthusiasm gap among Obama voters, the lack of a clear economic message and other missteps...