Coming up on today's show: 

• Errol Louis, political anchor of Spectrum NY1 News, host of Inside City Hall, and Daily News columnist, talks about what the Democratic 2020 presidential hopefuls had to say to the civil rights activists gathered for the National Action Network Convention, held in Midtown Manhattan last week.
• Sam Schwartz, aka Gridlock Sam, former NYC traffic commissioner, president and CEO of Sam Schwartz Engineering, and author of No One at the Wheel: Driverless Cars and the Road of the Future, developed the plan to raise money for mass transit and ease traffic by charging vehicles to enter Manhattan's central business district. He’s joined by Kate Slevin, Regional Plan Association (RPA) senior vice president for state programs and advocacy, to describe the plan as envisioned, what the lawmakers specified in the budget, the regional impact of congestion pricing and what to look for as the commission working out the details faces pushback and exemption requests.
• Dr. Emily Dufton, drug historian and author of Grass Roots: The Rise and Fall and Rise of Marijuana in America, talks about the history of how cannabis became illegal and examines some of the likely racist roots behind its more than 80-year prohibition.
• Henry Louis Gates Jr., professor at Harvard University, director of the W.E.B. Du Bois Institute for African and African American Research, and author of Dark Sky Rising: Reconstruction and the Dawn of Jim Crow, turns his attention to the post-Civil War Reconstruction era and the backlash to emancipation in his new PBS special and books, including his first addressed to young readers.