Our resources may be finite, but our will is infinite, and I am confident that if we come together and summon that great American spirit once again, we will meet the challenges of our time and write the next great chapter in our American story.

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.

We need to steer clear of this poverty of ambition, where people want to drive fancy cars and wear nice clothes and live in nice apartments but don't want to work hard to accomplish these things. Everyone should try to realize their full potential.

Contrary to the claims of some of my critics and some of the editorial pages, I am an ardent believer in the free market.

The ultimate goal is two states for two people: Israel as a Jewish state and the homeland for the Jewish people and the State of Palestine as the homeland for the Palestinian people - each state in joined self-determination, mutual recognition, and peace.

For the sake of our children and our future, we must do more to combat climate change.

It's important to know that the vast majority of people who were excited in 2008 are still really enthusiastic. We've got more volunteers now than ever, and they're engaged, they're motivated, they're not paying attention to the ups and downs of polls or Washington.