Which is worse, corruption you can see or corruption you can't? In Dark Money, a documentary about invisible corporate shenanigans in her home state of Montana, director Kimberly Reed makes the incisive case that the latter threatens to sink our democracy outright. Dark Money opens and closes with a flock of geese flying over a toxic copper quarry. As Reed's story unfolds, we learn that the beautiful birds' mass demise is only a tiny fraction of the wreckage caused by shady money moguls tinkering with electoral campaigns over a hundred years of Montana history. Montana is also ... the only state, according to Reed, to have fought back locally against the U.S. Supreme Court's 2010 rollback of laws preventing corporations and unions using their treasury funds for electioneering. Reed shows how Democrats and Republicans running for political and judicial office found themselves targeted by vicious attack ads from deep-pocketed non-profits with blandly vanilla names like Citizens United or Americans For Prosperity, or strategically crowd-pleasing monikers like Mothers Against Child Predators. No one had ever heard of these shape-shifting advocacy groups, and it was difficult to track the money back to the shadowy ideologues hiding behind them. [The] film shows how, with the Internet's global reach and the ever-growing concentration of money and power, dark money is redrawing the political landscape in ways that render parties irrelevant and imperil democracy itself.