We are so isolated in our own little worlds, in our own little geographies, that it's pretty hard to understand where someone else is coming from. And so I think that we have to really think about what that means as a country and, frankly, whether this segregation that we have is durable over the long run.

As a culture, working-class white Americans like myself had no heroes. We loved the military but had no George S. Patton figure in the modern army. I doubt my neighbours could even name a high-ranking military officer.

We need to think about how we teach working-class children about not just hard skills, like reading and mathematics, but also soft skills, like conflict resolution and financial management.

People in my hometown voted for President Reagan - for many, like my grandpa, he was their first Republican - because he promised that tax cuts would bring higher wages and new jobs. It seemed he was right, so we voted for the next Republican promising tax cuts and job creation, George W. Bush. He wasn't right.

I think a great leader is somebody who realizes it's not about them, it's about the people that they're serving, that they're really other-directed rather than self- directed.

In 2008, many Democrats and Republicans believed Hillary Clinton to be a responsible public leader - a firm hand on the wheel, experienced in matters of diplomacy, conflict, and national interest. The 3 A.M. phone call was a question mark with Barack Obama, but not for Hillary Clinton.

I believe UNAIDS' provocative leadership has been critical in addressing the AIDS epidemic and converting it from a death sentence to a chronic health condition.

The Nuremberg trials of Nazi leaders, in open court before an international tribunal, had a profound long-term effect in bringing Germans back to democracy and humanity.