Historian and writer Jon Meacham’s most recent book, “And There Was Light: Abraham Lincoln and the American Struggle,” dives deep into Lincoln and the why behind the actions of America’s 16th president, from personal to political. Jon joined David to talk about Lincoln’s anti-slavery roots, what Lincoln can teach us about the current political moment, the moral decisions we face as a country, and what qualities make a great American president.To learn more about how CNN protects listener privacy, visit cnn.com/privacy