Obama said if elected his government would "harness technology to confront the biggest challenges that America faces".

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.

If fake news that's being released by some foreign government is almost identical to reports that are being issued through partisan news venues, then it's not surprising that that foreign propaganda will have a greater effect, because it doesn't seem that far-fetched compared to some of the other stuff that folks are hearing from domestic propagandists.

That's what the leadership was teaching me, day by day: that the self-interest I was supposed to be looking for extended well beyond the immediacy of issues, that beneath the small talk and sketchy biographies and received opinions, people carried with them some central explanation of themselves. Stories full of terror and wonder, studded with events that still haunted or inspired them. Sacred stories.

I'm personally very grateful to my many friends in the Greek-American community, sons and daughters of Greece who have found success in every walk of American life.

When you're a candidate and you say something that is inaccurate or controversial, it has less impact than it does when you're president of the United States. Everybody around the world's paying attention. Markets move. National security issues require a level of precision in order to make sure that you don't make mistakes.

Sometimes when these kinds of things happen, it can seem a little bit too much to bear. But what I want the people of Louisiana know is that you're not alone on this. Even after the TV cameras leave, the whole country is going to continue to support you and help you until we get folks back in their homes and lives are rebuilt.