My second piece of advice is to stay global. As the world continues to change and we become more connected to each other, globalization will bring both benefits and disruptions to our lives. But either way, it's here, and it's not going away.

Of course, violence will not end with our combat mission. Extremists will continue to set off bombs, attack Iraqi civilians and try to spark sectarian strife. But ultimately, these terrorists will fail to achieve their goals.

We have the power to make the world we seek, but only if we have the courage to make a new beginning.

I believe in keeping guns out of our inner cities, and that our leaders must say so in the face of the gun manfuacturer's lobby. But I also believe that when a gangbanger shoots indiscriminately into a crowd because he feels someone disrespected him, we have a problem of morality. Not only do we need to punish that man for his crime, but we need to acknowledge that there's a hole in his heart, one that government programs alone may not be able to repair.

Hillary Clinton has been in politics for the same reason I am - because we can improve other people's lives by doing this work.

We need to teach our kids that it's not just the winner of the Super Bowl who deserves to be celebrated, but the winner of the science fair.

If Mr. [Donald] Trump is up 10 or 15 points on Election Day and ends up losing, then, you know, maybe he can raise some questions. That doesn't seem to be the case at that moment.