What we know about Russian meddling and Putin’s playbook

U.S. intelligence agencies believe Russia attempted to sway the U.S. election through DNC email hacking and an influence campaign. But to what degree were President Trump’s campaign advisers in contact with Russians? And what made Americans susceptible to influence? William Brangham examines what we know with Evan Osnos of The New Yorker and former CIA official John Sipher.