“More than a dozen states are set to hold US House primaries in the next five weeks,” CNN reports. “Some will set up key general election matchups that could determine control of the US House in November. Others will reveal something about the dynamics that are shaping the two parties and what it means to be electable.”“President Donald Trump’s political power will be put to a high-profile test in Kentucky, where he’s targeted Rep. Thomas Massie, and a crowded primary in Montana. And Democrats are facing off in crowded primaries in Pennsylvania, Nebraska and California, with opposing visions of the party’s future and who is most likely to flip Republican-held districts.”