When people see opportunity, when they have a sense of control of their own destiny, then they're less vulnerable to the propaganda and twisted ideologies that have been attracting young people - particularly being turbocharged through social media.

I opposed the Defense of Marriage Act in 1996. It should be repealed and I will vote for its repeal on the Senate floor. I will also oppose any proposal to amend the U.S. Constitution to ban gays and lesbians from marrying.

As I said in my State of the Union address ensuring the security of the United States and the safety of our people demands a smart, patient and disciplined approach to the world.

This is our moment...while we breathe, we hope. And where we are met with cynicism and doubts and those who tell us that we can't, we will respond with that timeless creed that sums up the spirit of a people: Yes, we can.

We need scientists to design new fuels. We need farmers to help grow them. We need engineers to invent new technologies. We need entrepreneurs to sell those technologies. We need workers to operate assembly lines that hum with high-tech, zero-carbon components. We need builders to hammer into place the foundations for a clean energy age. We need diplomats and businessmen and women, and Peace Corps volunteers to help developing nations skip past the dirty phase of development and transition to sustainable sources of energy. In other words, we need you.

In my heart I know you didn't come here just for me, you came here because you believe in what this country can be. In the face of war, you believe there can be peace. In the face of despair, you believe there can be hope. In the face of a politics that's shut you out, that's told you to settle, that's divided us for too long, you believe we can be one people, reaching for what's possible, building that more perfect union.

What I'm thinking about are the millions of people, many of whom write me very personal letters :"Dear Mr. President: I did not vote for you. I was against Obamacare. And then my son who didn't have health insurance signed up and we just found out that he had an illness. And thankfully he's now covered, otherwise he might not have gotten treatment and I might have lost my house."