Democratic voter turnout in this year’s House primaries increased in each of the 19 competitive, comparable House districts compared to 2014, and doubled in more than two thirds of them. That’s far better than Republican voter turnout, which increased in 14 of those districts but didn’t double in any of them.

Why it matters: Poor turnout has been the scourge of Democrats’ efforts to win congressional elections in the last decade. But this data suggests that a surge of anti-Trump enthusiasm could boost their turnout in November — and not just in already-blue areas, but in parts of the country that could deliver control of the House to the Democrats.