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

Change doesn't happen with people sitting on their behinds, getting lazy.

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

I like to think that with me, what you see is what you get, and you can like or dislike it, it's up to you, but it's straight. That's something that I pride myself on.

What I would say about me is: What you see is what I get.

It may not be what you would've chosen, but we all have a responsibility to be active citizens and shape our system and our future.

I've been very lucky to have had a supportive family, a great education, enormous opportunity and challenge.