Great challenges confront our great nation. We seek to meet them by rising to the task, not by defining our country down.

I am sympathetic to developing countries’ concerns: because of our emissions it’s their crops that will disappear; because of our inaction, it’s their fields that turn to desert...

I’ve often said that global climate change is an issue where no one has the luxury of being “half-pregnant.” You either are or you aren’t. And so it is with climate change. You either understand and accept the science – or you don’t. Folks this isn’t a cafeteria where you can pick and choose and accept the science that tells us what is happening, but then reject the science that warns us what will happen.

Ask Osama bin Laden is he is better off now than he was four years ago.

We have to recognize that there is a strong, fresh wind blowing, powered by these new information technologies. It will be increasingly difficult for dictators to impose their will through sheer brutality.

I think the question of abortion is one that should be left for the states to decide.

No one is going to question my commitment to the defence of our nation. I don't know what it is these Republicans, who didn't serve in any war, have against those of us who are Democrats who did.