Barack Obama: “Being a champion means giving back to the folks who gave so much to you.”

Your task is not to impose litmus tests.

Every president here today, as different as we are, has tried our best to uphold the values that John McCain and Mitt Romney believed in no less than I did.

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…

The success of this experiment was never a given.