Barack Obama: “We've been sounding this urgency for the last five years.”

never talks that way when they are in the same room.

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…

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.

helped lead some of the most significant movements for change in human history