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The US moved to electronic voting in part due to the Florida vote counting fiascos in 2000. Electronic voting machines prevent users from making undervotes and overvotes (picking no candidates, picking more than one candidate). The machines also prevent the hanging chad issue in 2000 where the voters intention was unclear. Electronic voting machines also enable blind voters to cast votes without assistance giving them privacy and assurance that their vote wasn't tampered with. Paper voting can also have it's own security weaknesses like ballot stuffing.