More than 198 million Americans—that's about 61% of the US population, as Gizmodo points out—had personal information and political data exposed this month. 

It includes home addresses, birthdates, phone numbers, plus data used to predict which way they might vote on specific issues and what religion and ethnicity they might be. 

UpGuard cyber risk analyst Chris Vickery discovered last week that Deep Root, a marketing firm contracted by the Republican National Committee, stored the data on an Amazon cloud server with no password, meaning anyone who found the URL could access it. (It has since been secured, per the Hill.) In a post about the discovery Monday, UpGuard calls it "the largest known data exposure of its kind," pointing out that the data covers almost all of the 200 million registered voters in the US.

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