Barack Obama: “Today America honors two of her sons who served in World War I, nearly a century ago.”

A drift towards extremism was "not inevitable

And I will fight for that, even if I don’t always think it’s going to win.

It is a basic principle of American democracy that the government can’t selectively target individuals simply because of their political beliefs or what they say.

I think when we act on that basis, it doesn't always work out, but over time things do get better.