I have to separate my personal concerns from my professional responsibilities.

The United States share of the African market it's very small, it's only about 8 percent.

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

Be who you are. If you spend all of your time worrying about how people view you, you will not be either faithful to yourself or effective in what you're trying to do.

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.

Can I be blunt? Yes. Can I be diplomatic? Yes. Can I concoct a mixture of vinegar and honey when the circumstances warrant? Yes.