It's not because John McCain doesn't care. It's because John McCain doesn't get it.

This was the moment when the rise of the oceans began to slow and our planet began to heal.

If we can't meet with our friends, I don't know how we're going to lead the world in terms of dealing with critical issues like terrorism.

We have to deal with issues like inequality, we have deal with issues of economic dislocation, we have to deal with peoples fears that their children won't do as well as they have. The more aggressively and effectively we deal with those issues, the less those fears may channel themselves into counter-productive approaches that pit people against each other.

Peace is not just the absence of war. True peace depends upon creating the opportunity that makes life worth living. And to do that, we must confront the common enemies of human beings: nuclear weapons and poverty; ignorance and disease.

I say that is because those are the times where sometimes you feel actually a little bit hurt. Because you feel like saying to these folks, "[Don't] you think if I could do it, I [would] have just done it. Do you think that the only problem is that I don't care enough about the plight of poor people, or gay people, or immigrants, or ...?"

Each path to knowledge involves different rules and these rules are not interchangeable.