This episode contains strong language. Today’s Senate primary in Kentucky has been transformed by the outcry over police brutality. What can the election tell us about the future of Democratic politics? Guest: Jonathan Martin, who covers national politics for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily Background reading: Amy McGrath was considered a safe bet in the Democratic primary in Kentucky. But the recent movement for racial justice has elevated the candidacy of her African-American rival, Charles Booker, in the race to defeat Mitch McConnell.