How personal data helps candidates predict your vote

Aired: 12/18/2015 | 0:09:55 | Clip
Based on massive amounts of information—from your party affiliation to your Amazon account—political campaigns can determine whether you may vote for their candidate and whether they should spend the resources to get you to do so. But will so-called “microtargeting” be a deciding factor in the 2016 presidential race or has its hype been overblown? NewsHour's Jeff Greenfield reports.