Voter information compiled by Republican data firm Deep Root Analytics and two other Republican contractors was accidentally exposed online.
The leaked information included names, birth dates, addresses, voter registration details and social media posts, according to security firm UpGuard.
Some 1.1 terabytes of data were available for download and not protected by a password.
The leak is said to have occurred June 12 and secured June 14. The cause was an improperly configured security setting.
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