Barack Obama: “This is something that is not only the right thing to do, but it's also critical to our economy.”

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

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.

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…