Louisiana Governor John Bel Edwards talks with Rachel Maddow about how his state is dealing with historic, deadly flooding displacing tens of thousands of people, and how the federal government is assisting in coping with the tragedy as it continues to unfold. Larry Sabato, director of the Center for Politics at the University of Virginia, talks with Rachel Maddow about the remarkable lead polls show Hillary Clinton has over Donald Trump, and the "rally effect" that has Trump and his supporters convinced the polls are wrong. Rachel Maddow notes the atmosphere of racism that was overseen by Stephen Bannon at Breitbart News, both on its pages and by its staff, before Donald Trump chose to put him in charge of his entire campaign.