When what you’re doing doesn’t work for 50 years, it’s time to try something new.

We're showing that there's no excuse for other nations to come together, both developed and developing, to achieve a strong global climate agreement next year.

At the constitutional level, what we of course have assured is that women have the ability to make these reproductive decisions up to the point of viability.

In ancient times and in our times, Muslim communities have been at the forefront of innovation and education.

If you don't have good people, and you don't have a good process and you don't have, at some level, the basic reverence for [presidential] office, and an understanding of the incredible responsibilities and obligations, then, I think you can get into trouble.

I would not be running for President if I didn't believe with all my heart that this is what the vast majority of Americans want for this country. This union may never be perfect, but generation after generation has shown that it can always be perfected. And today, whenever I find myself feeling doubtful or cynical about this possibility, what gives me the most hope is the next generation - the young people whose attitudes and beliefs and openness to change have already made history in this election.

The Supreme Court nominations [example]. I mean, the fact that Mitch McConnell, the leader of the Republicans, was able to just stop a nomination almost a year before the next election and really not pay a political price for it, that's a sign that the incentives for politicians in this town to be so sharply partisan have gotten so outta hand that we're weakening ourselves.