Who’s hosting: Georgetown University professor and MSNBC regular Neal Katyal, who was once acting solicitor general of the United States and has argued 50 cases at the Supreme Court. Sample episode: Katyal and John Legend discuss the consequences of the Supreme Court’s decision to strike down key aspects of the Voting Rights Act in 2013. Who’s hosting: Former New York Times public editor and Washington Post media writer Margaret Sullivan, currently a Duke professor and a columnist for Guardian US.