Barack Obama: “It's a simple American promise.”

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.

We designed the center not to be some lifeless mausoleum.

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

No one was more skilled at bringing people together and getting legislation passed.