Hacking Democracy filmed over 3 years, first shown on HBO (a unit of Time Warner) in 2006 and released on DVD in 2007. The film reveals many strange facts about paperless (or e-voting) systems that established during elections in the U.S.A. in the last years. It focuses on the story of Bev Harris, director of nonprofit election watchdog group called Black Box Voting, and her investigations of potential security flaws inherent in electronic voting.
Watch these other two great documentaries about election fraud free online: