Let's remember that our leadership is defined not just by our defence against threats, but by the enormous opportunities to do good and promote understanding.

I was a constitutional law professor, which means unlike the current president I actually respect the Constitution.

American leadership is not simply a matter of going it alone and bearing all of the burden ourselves.

Congress should fund research on the effects that violent video games have on young minds... We don't benefit from ignorance. We don't benefit from not knowing the science.

I will listen to you, especially when we disagree.

Whatever we think of the past, we must not be prisoners to it.

I can't really characterize any country, except to say that we work well with a number of our foreign counterparts.