https://apnews.com/f6876669cb6b4e4c9850844f8e015b4c > It was the kind of security lapse that gives election officials nightmares. In 2017, a private contractor left data on Chicago's 1.8 million registered voters — including addresses, birth dates and partial Social Security numbers — publicly exposed for months on an Amazon cloud server. > Later at a tense hearing , Chicago's Board of Elections dressed down the top three executives of Election Systems & Software, the nation's dominant supplier of election equipment and services.