(Automatic Voting Machine Co/PhotoQuest/Getty Images)A hand as it inserts a ballot into a box during the U.S. presidential election in Lancaster, Pennsylvania, Nov. 2, 1948. (PhotoQuest/Getty Images)An over-the-shoulder view of an unidentified woman as she demonstrates how to use an IBM voting machine in 1966. The voter casts a ballot by punching holes in a card, which then drops into a ballot box. (Getty Images)A hand presses the switch, marking a selection in a 1970s-style voting machine. (Getty Images)A view showing empty voting booths during the Senate elections in 1986.