I was pretty realistic to people about what we could get done, and the situation we were in, and trying to tamp down expectations. If you listen to my stump speeches, if you listen to what I said at Grant Park, I kept on saying, "Look, this is not just about me, this is not going to happen in one year, or one term, or even one presidency." And we tried to layer into everything we were saying a sense of hope, but also realism.

We are not a nation that says, 'Don’t ask, don’t tell.' We are a nation that says, 'Out of many, we are one.' We are a nation that welcomes the service of every patriot. We are a nation that believes that all men and women are created equal. Those are the ideals that generations have fought for. Those are the ideals that we upheld today.

The brain is a body part too; we just know less about it.

I do think that I am generally optimistic.

I've sought a constructive relationship with Russia, but what I have also been is realistic in recognizing that there is some significant differences in how Russia views the world and how we view the world.

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 think if you look at almost every year under every president over the last, I don't know, 20, 30 years, you're going to be hard-pressed to find a year in which the majority of Americans thought we were on the right track.