New America Foundation national security studies program director Peter Bergen, author of Manhunt: The Ten-Year Search for Bin Laden From 9/11 to Abbottabad, explains to Anne-Marie Slaughter what the terrorist attack in Nairobi tells us about Al Qaeda today. June Thomas, Slate’s culture critic, and Andrés Martinez, editorial director of Zócalo Public Square and the New America Foundation, join Bergen and Slaughter to talk about national security in a lighter context: What the TV show Homeland, which just had its season three premiere, can teach Americans about government and intelligence issues.