What I believe is that marriage is between a man and a woman, but what I also believe is that we have an obligation to make sure that gays and lesbians have the rights of citizenship that afford them visitations to hospitals, that allow them to be, to transfer property between partners, to make certain that they're not discriminated on the job.

The greatest danger of all is to allow new walls to divide us from one another

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

That's why I stand here tonight. Because for two hundred and thirty two years, at each moment when that promise was in jeopardy, ordinary men and women - students and soldiers, farmers and teachers, nurses and janitors - found the courage to keep it alive.

To those who cling to power through corruption and deceit and the silencing of dissent, know that you are on the wrong side of history; but that we will extend a hand if you are willing to unclench your fist.

The Greek people have gone through some very difficult times and there's still a hard road ahead, but despite those hardships, Greece has continued to be a reliable ally, has shown true compassion to fellow human beings in need. It's an example of the Greek character.

Our destiny is not written for us, but by us.