Will Jawando and Mark McKinnon lay out the state of the 2020 race. Ali Vaez and Christiane Amanpour discuss whether the U.S. and Iran are set on a collision course for war. Elif Shafak joins the program to discuss her book, "10 Minutes 38 Seconds in This Strange World." Alicia Menendez speaks to novelist Kristen Arnett about her book, "Mostly Dead Things."