As U.S. voters increasingly spend more of their lives online, political campaigns and other outside groups are trying to figure out how best to meet them on these digital spaces.
But in the rush to perfect the effectiveness of digital ads, regulators have been slow to catch up. Will the lessons of 2016, and what can happen when nefarious actors hijack those platforms to spread disinformation, prove an effective warning for 2020 and beyond? And will Democrats be able to catch up to the Trump campaign's robust online operation?
Also, continuing with our "Candidate Talk" series, Amy talks with Senator Michael Bennet about trying to break out in a crowded Democratic field.
Patrick Ruffini, Republican digital strategist, partner and co-founder of Echelon Insights, a polling and data analytics firm
Guy Cecil, Chairman of Priorities USA, a Democratic super PAC
Kevin Roose, tech columnist for Business Day at The New York Times
Young Mie Kim, professor at the school of journalism and mass communication at the University of Wisconsin-Madison
Ellen Weintraub, Chair of the Federal Election Commission
Michael Bennet, United States Senator from Colorado, Democratic Presidential candidate