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

When you try to sow the seeds of doubt in people`s minds about the legitimacy of our election, that undermines democracy. Then you`re doing the work of our adversaries for them.

The conservative revolution that Reagan helped usher in gained traction because Reagan's central insight - that the liberal welfare state had grown complacent and overly bureaucratic, with Democratic policy makers more obsessed with slicing the economic pie than with growing the pie - contained a good deal of truth.

In order to make the tough decisions we have to know what our values are and who we're fighting for and our priorities and if we are spending $300 billion on tax cuts for people who don't need them and weren't even asking for them, and we are leaving out health care which is crushing on people all across the country, then I think we have made a bad decision and I want to make sure we're not shortchanging our long term priorities.

I spoke on the phone with President Rouhani of the Islamic Republic of Iran. The two of us discussed our ongoing efforts to reach an agreement over Iran's nuclear program. While there will surely be important obstacles to moving forward and success is by no means guaranteed, I believe we can reach a comprehensive solution.

In your generation, everybody is constantly bombarded with all kinds of different input from different cultures, and that's a strength, that's a positive thing. That's why I remain confident about America's ability to compete in the world, precisely because we've got a little bit of everybody in this country.

We're showing that there's no excuse for other nations to come together, both developed and developing, to achieve a strong global climate agreement next year.