Part of what's unique about climate change, though, is the nature of some of the opposition to action. It's pretty rare that you'll encounter somebody who says the problem you're trying to solve simply doesn't exist. When President Kennedy set us on a course for the moon, there were a number of people who made a serious case that it wouldn't be worth it; it was going to be too expensive, it was going to be too hard, it would take too long. But nobody ignored the science. I don't remember anybody saying that the moon wasn't there or that it was made of cheese.

Even limited military actions end up carrying with them great costs and unintended consequences.

I'll turn the page on a growing empire of classified information. We'll protect sources and methods, but we won't use sources and methods to hide the truth.

We have to recognize we've got some big problems on race, just like we got still big problems on crime, just like we got big problems on just about everything. But we also have to make sure that we've - draw confidence from the progress that we have made, 'cause otherwise, you get into this cycle of cynicism.

We are not a nation that says, 'Don’t ask, don’t tell.' We are a nation that says, 'Out of many, we are one.' We are a nation that welcomes the service of every patriot. We are a nation that believes that all men and women are created equal. Those are the ideals that generations have fought for. Those are the ideals that we upheld today.

Three months is a lifetime in politics.

Don't let your failures define you.