Targeted political advertising could change how and whether people vote

The Trump campaign sent targeted ads to Black people in 2016 to deter them from voting, according to an investigation published this week by Channel 4 in the U.K. The campaign denies this, but targeted digital advertising is a big part of political campaigns. So big that Google banned microtargeting in political ads; Twitter banned political ads completely. Facebook has not. How effective are targeted ads? If they can change a vote, should they be allowed? Molly speaks with John Deighton, a professor at Harvard Business School. His research focuses on digital and direct marketing. He says targeted advertising works, but it’s not the real problem.