Punchbowl News: “Something strange is happening in several crucial House Democratic primaries.”“Mysterious super PACs are quietly emerging and spending heavily to boost candidates whom many top Democrats view as less formidable, or even toxic, in general elections. Three of these stealthy groups spent a collective $4.3 million so far in five primaries in Nebraska, Pennsylvania, California, Texas and New Jersey.”“The source of these groups’ funding is obscured. That’s somewhat common in the post-Citizens United era of dark money. But what’s truly baffling is that it’s nearly impossible to tell who is behind these super PACs. And their operators are becoming incredibly skilled at covering their tracks.”