Barack Obama: “It's easy to rile up a crowd; nothing's easier than riling up a crowd by stoking anger and division. That's not what we…”

They're meant to remind us of who we can be, to remind us of what's possible, so we can forge ahead.

Your task is not to impose litmus tests.

The success of this experiment was never a given.

Of course, we did not accomplish everything we set out to do. No administration does. Some of the exhibits reflect unfinished business, in some cases, my own shortcomings and mistakes, in some cases because - as a sign I kept on the…