Harry Reid is under a lot of job-retention stress these days, so Americans might forgive him the occasional word fumble. When he recently took to the Senate floor to berate the billionaire brothers Charles and David Koch for spending "unlimited money" to "rig the system" and "buy elections," the majority leader clearly meant to be condemning unions.

It's an extraordinary thing, in a political age obsessed with campaign money, that nobody scrutinizes the biggest, baddest, "darkest" spenders...