Abraham Lincoln's leadership is often remembered for reaching across the aisle – he tried to find compromises even in the most divisive times. But as successful as he was in saving the union, Lincoln also spent a lot of time agreeing to disagree with those around him. In his new book, Differ We Must, NPR's Steve Inskeep examines Lincoln's life through 16 such confrontations. In today's episode, Inskeep chats with NPR's Scott Simon about how Lincoln strategically positioned himself on issues like slavery, abolition and democracy – even when his own best friend opposed his stances. To listen to Book of the Day sponsor-free and support NPR's book coverage, sign up for Book of the Day+ at plus.npr.org/bookoftheday