7 U.S. states automatically remove voters from rolls if they do not vote for a certain period of tim
""Number of states that automatically remove voters from the rolls if they do not vote for a period of time: 7""Harper's Index," Harper's Magazine, 333, no. 1997 (2016), 9.- See more at: http://smallplanet.org/content/7-us-states-automatically-remove-voters-rolls-if-they-do-not-vote-certain-period-time#sthash.ZIb7cYlY.dpuf