Political data gathered on more than 198 million US citizens was exposed this month after a marketing firm contracted by the Republican National Committee stored internal documents on a publicly accessible Amazon server, reports say. From a ZDNet article: It's believed to be the largest ever known exposure of voter information to date. The various databases containing 198 million records on American voters from all political parties were found stored on an open Amazon S3 storage server owned by a Republican data analytics firm, Deep Root Analytics. UpGuard cyber risk analyst Chris Vickery, who found the exposed server, verified the data. Through his responsible disclosure, the server was secured late last week, and prior to publication. This leak shines a spotlight on the Republicans' multi-million dollar effort to better target potential voters by utilizing big data. The move largely a response to the successes of the Barack Obama campaign in 2008, thought to have been the first data-driven campaign. Further reading: Republican Data-Mining Firm Exposed Personal Information for Virtually Every American Voter - The Intercept; The RNC Files: Inside the Largest US Voter Data Leak - Upguard; Data on 198M voters exposed by GOP contractor Data On 198M Voters Exposed By GOP Contractor - The Hill.