In a few years, you should be able to plug your American-made plug-in hybrid into the outlet in your garage, so that you never use a drop of gas on your daily commute. This won't happen overnight, but I promise you, it is closer than you think.

What remains unchanged is the principle, which is that we do not launch wars without overwelming reasons, and overwhelming alliances, and without overwhelming force.

If you can resolve this transition of [Bashar] Assad, that is absolutely possible, but you have to have a clarity for everybody about the way forward.

I'm an internationalist. I'd like to see our troops dispersed through the world only at the directive of the United Nations.

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...

We are a nation of laws and liberties, not of a knock in the night. So it is time to end the era of John Ashcroft. That starts with replacing the Patriot Act with a new law that protects our people and our liberties at the same time.

Strong leadership demands more than the willingness to use force. It means directing the use of the right tools at the right time for the right purpose and the right cause.