You know, one of the things I think you understand as president is you're held responsible for everything, but you don't always have control of everything, right?

By 2025 we expect new spacecraft designed for long journeys to allow us to begin the first ever crewed missions beyond the Moon into deep space. So we'll start by sending astronauts to an asteroid for the first time in history. By the mid-2030s I believe we can send humans to orbit Mars and return them safely to Earth. And a landing on Mars will follow and I expect to be around in see it.

The biggest threat, when it comes to climate change and pollution, isn't going to come from us because we only have 300 million people. It's going to come from China with over 1 billion people and India with over 1 billion people.

The arts are what makes life worth living. You've got food, you've got shelter, yeah. But the things that make you laugh, make you cry, make you connect - make you love are communicated through the arts. They aren't extras.

As tough as things have been, I am convinced you are tougher. I've seen your passion and I've seen your service. I've seen you engage and I've seen you turn out in record numbers. I've heard your voices amplified by creativity and a digital fluency that those of us in older generations can barely comprehend. I've seen a generation eager, impatient even, to step into the rushing waters of history and change its course.

The first thing I'd do as president is sign the Freedom of Choice Act.

My family, frankly, they weren't folks who went to church every week. My mother was one of the most spiritual people I knew but she didn't raise me in the church, so I came to my Christian faith later in life and it was because the precepts of Jesus Christ spoke to me in terms of the kind of life that I would want to lead.