Adversity in almost all the presidents I’ve studied changes them. For Teddy Roosevelt, in 1884, losing his wife and his mother on the same day, in the same house. He goes to the Badlands, and he’s suddenly out among people. Both he and F.D.R. had to move beyond their privileged class. Polio and his time at Warm Springs, Georgia [rehab facility], allowed F.D.R. to do that. And then they created a different sense of themselves, connected to other people—partly what you’re talking about—wanting to make other people’s lives better. Fate had dealt them an unkind hand, like it does to many, and they suddenly felt more deeply toward a wider range of people.