Barack Obama: “With each new discovery and the new power it brings comes new responsibility.”

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.

I thought this was the South Side of Chicago.

I hope this center will serve as an affirmation of just how special, how precious our democracy truly is.

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