The documentary Dark Money" turns a story about campaign finance into a political thriller. Beyond that - in a veritable magic trick in these divisive times - viewers may well find themselves rooting for politicians who don't share their political views. "Dark Money" ... delves into a seemingly nonpartisan issue: the use of anonymous funds to influence political campaigns on both sides of the aisle. Director Kimberly Reed ... first became interested in the topic after Citizens United vs. Federal Election Commission, the 2010 U.S. Supreme Court decision that political spending was a protected form of free speech. "I joked around for years that I was going to change my name to Cassandra, because nobody was listening to my prophecies of doom," said Reed. "You could just see that campaign finance was going to get worse and worse, and I watched it happen every election cycle." The outcome has been even grimmer than she imagined. In addition to the flood of corporate money that funded super PACs, a more insidious tidal wave started to wash over the country in the form of anonymous donations, or "dark money." Looking for a way into the challenging material, Reed found it in ... her home state of Montana. Former Federal Election Commission Chair Ann Ravel appears in "Dark Money" to provide a depressing counterpoint to Montana's battle. "It's such a good movie," Ravel said, "because Kim juxtaposes what's happening on the federal level with the hopeful side in Montana and in other states."