Number of potential voters in key states who saw Facebook ads crafted by Cambridge Analytica promoting Republican Sens. Richard Burr, Pat Toomey, Roy Blunt, Rob Portman, Kelly Ayotte and Ron Johnson from June 21, 2016, through July 1, 2016, according to Cambridge’s internal metrics. The ads were part of a partnership between the controversial political consulting firm and the National Shooting Sports Foundation to target gun owners with political messaging using sensitive personal information.