In the United States, if 43 percent of eligible voters do not vote, then democracy is weakened.

By so many measures, our country is stronger and more prosperous than it was when we first got here. And I'm hopeful we'll build on the progress we've made in the years to come.

Climate change constitutes a serious threat to global security, an immediate risk to our national security, and, make no mistake, it will impact how our military defends our country.

The law is a powerful thing but the law doesn't always change what's in people's hearts. And so all of us have an obligation to think about how we're treating other people.

You have to have a strong team around you [being a president].

The spirit's there and that's not just my imagination. I think if you look at surveys and attitudes among young people, you see it.

We must act, knowing that our work will be imperfect.