I have been to Libya and walked the streets of Benghazi myself.

I've taken my knocks here and there, but I believe my intentions are good. Doesn't mean everything I do is perfectly executed or I don't make mistakes. Of course I do.

President Obama is funny, he's thoughtful, he's challenging, he's fun to work with - and it's been an extraordinary privilege.

I think most Americans understand that we went through a period in which American leadership was judged quite critically internationally.

Governing is different than campaigning, and that comes with a whole different level of responsibility.

Well, I think by any expectation South Africa has come a tremendously long way. We've seen a society that many people thought couldn't withstand a peaceful transition to democracy without a great deal of violence, in fact, make that transition and do it in relative peace and security.

President Obama is an extraordinary person to work with and for.