Republican Group to Hatch Anti-Hillary Clinton Facebook Ad at Vegas Debate Venue

Hillary Clinton's supporters in Las Vegas for Tuesday night's debate may not appreciate what pops up on their iPhones and when they open the Facebook app.

Greeting them will be an ad, placed by Republican opposition research group America Rising, that documents some of the former secretary of state's worst debate moments (in their view, of course). The group's ad buy is designed to target Democrat-leaning users through Facebook's voter file—and it will specifically hit the feeds of users wandering anywhere inside the night's debate venue, the Wynn Hotel. (Facebook is a co-sponsor of the night's debate with CNN.) Facebook tracks just about everything its users are doing, including political candidates or issues that have received likes or shares. That type of information helps create individual voter files, which campaigns (or, in this case, a super-PAC), can utilize to target their ads.