One of the things you learn as president is, as powerful as this office is, you have limited bandwidth. And the time goes by really quickly and you're constantly making choices, and there are pressures on you from all different directions - pressures on your attention, not just pressures from different constituencies. And so you have to be pretty focused about where can you have the biggest, quickest impact.

If John McCain wants to have a debate about who has the temperament, and judgment, to serve as the next Commander-in-Chief, that's a debate I'm ready to have.

The Middle East is obviously an issue that has plagued the region for centuries.

One of my strengths is I have a pretty even temperament. I don't get too high when it's high and I don't get too low when it's low. And what I found during the course of the presidency, and I suppose this is true in life, is that investments and work that you make back here sometimes take a little longer than the 24-hour news cycle to bear fruit.

People'd be like, "Oh, spending taxpayer money." It's like, "No, no, I actually I'm paying for all of this. The only thing I don't pay for is Secret Service and an airplane."

You have the ability and gifts to do whatever you want". It is your turn now to change the world. Yes we can!

I am living testimony to the moral force of non-violence. I know there's nothing weak - nothing passive - nothing naïve - in the creed and lives of Gandhi and King.