The voting machine that cast between 50,000 and 60,000 extra votes for New York gubernatorial candidates in November has a bug that causes it to misread some ballots and add additional votes to others when the machine itself overheats, according to a review by the state Board of Election. All of the so-called “over-votes” were thrown out after election workers reported an unrealistic spike in the number of votes from the machine, from manufacturer Election Systems and Software (ES&S), which apparently overheated during the hour or so the polling location was closed for lunch. In 2010 NYC’s City Board of Elections decided to replace its old lever-driven voting machines, that required voters to flip a lever to register their choices with a newer model from ES&S. Rather than flipping a lever, voters fill in oval spaces on paper ballots, then scan the ballots into the voting machine to register their choices. The machine counts votes automatically; the stored paper ballots remain serve as the source for recounts or backups for lost votes.