Barack Obama: “Today, we celebrate our heritage as a country bound together by fidelity to a set of ideas and a system of governance…”

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

A drift towards extremism was "not inevitable

It is a decision about how do we face and embrace this finite amount of time we have on the planet.

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