Guerilla filmmaker James O’Keefe is famous for having busted institutions ranging from the fraudulent voter-registration group ACORN to NPR. His Project Veritas team has also piled up an impressive array of videos documenting that citizen concerns about vote fraud could easily be translated into fraudulent votes with very little chance of detection.
http://www.nationalreview.com/article/438754/james-okeefe-voter-fraud-videos-prove-voter-ID-laws-needed