Photograph by Joshua Bright / The Washington Post via Getty

This week, new stories emerged about how the political consulting firm Cambridge Analytica used data from tens of millions of Facebook profiles to shape Trump’s culture war. Cambridge Analytica is almost wholly owned by the family of Robert Mercer, a billionaire donor with a far-right vision of America. Jane Mayer joins Dorothy Wickenden to discuss how dark money and data mining are being used to influence elections and undermine democracy.