The window is closing.

Our journey is not complete until all our children... know that they are cared for and cherished and always safe from harm.

As a nuclear power - as the only nuclear power to have used a nuclear weapon - the United States has a moral responsibility to act.

We should foster a culture in which people's private religious beliefs, including atheists and agnostics, are respected. And that's the kind of culture that I think allows all of us, then, to believe what we want. That's freedom of conscience. That's what our Constitution guarantees.

If any individual who objects to government policy can take it in their own hands to publicly disclose classified information, then we will never be able to keep our people safe or conduct foreign policy.

I believe, in the words of Dr. Martin Luther King Jr., that there is such a thing as being too late, and when it comes to climate change, that hour is almost upon us.

The thing about hip-hop today is it's smart, it's insightful. The way they can communicate a complex message in a very short space is remarkable.