Abraham Lincoln made history in 1863 when he issued the Emancipation Proclamation, effectively freeing enslaved people across the U.S. But he expected it to cost him reelection. In his new book, And There Was Light, Pulitzer prize-winning biographer Jon Meacham dives into how Lincoln's moral vision allowed him to stand his ground, even in the face of great criticism. Meacham tells NPR's Steve Inskeep that Lincoln's views on God and morality can teach us a thing or two in today's political climate.