When people are oppressed, and human rights are denied - particularly along sectarian lines or ethnic lines - when dissent is silenced, it feeds violent extremism, it creates an environment that is ripe for terrorists to exploit. When peaceful, democratic change is impossible, it feeds into the terrorist propaganda that violence is the only answer available.

I'm not talking about blind optimism, the kind of hope that just ignores the enormity of the tasks ahead or the road blocks that stand in our path. I'm not talking about the wishful idealism that allows us to just sit on the sidelines or shirk from a fight. I have always believed that hope is that stubborn thing inside us that insists, despite all the evidence to the contrary, that something better awaits us so long as we have the courage to keep reaching, to keep working, to keep fighting.

I've called on Congress to repeal the so-called Defense of Marriage Act to help end discrimination to help end discrimination against same-sex couples in this country. Now, I want to add we have a duty to uphold existing law, but I believe we must do so in a way that does not exacerbate old divides. And fulfilling this duty in upholding the law in no way lessens my commitment to reversing this law. I've made that clear.

Clearly, Iran has influence in Iraq. Iraq has a majority Shi'a population, they have relationships to Iran. Some are natural.

Climate change is one of the issues I worry most about because its impacts are enormous. But they're gradual, they're not immediate.

What I could not support was a dumb war, a rash war, a war based not on reason but on passion, not on principle but on politics.

This victory alone is not the change we seek; it is only the chance for us to make that change.