In advance of yesterday’s primaries, we saw some electoral anxieties of a slightly new variety: would voters turn out in the face of COVID-19? In the end, over 3.5 million people voted — not an appreciable decline, but then, the virus is still relatively limited here in the US. And even under the best of circumstances, over 40 percent of American citizens don’t vote. In fact, in November 2016, around 100 million eligible voters passed on the opportunity. That’s more people who voted for either Hillary Clinton or Donald Trump. And it might be even more than that, since nonvoter statistics seem often to be underreported. Eitan Hersh, associate professor of political science at Tufts, was an academic adviser on a new Knight Foundation study, The 100 Million Project: The Untold Story of American Non-voters. It was the largest survey of chronic nonvoters in history — and it overturned some age-old conventional wisdom.