Barack Obama: “OK, guys, in the 2030s I want you to have humans capable of going to Mars with the intention of landing there.”

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.

In forming our union, the founders fell terribly short of the Declaration's promise, leaving slavery intact, allowing states to restrict the franchise to white men who owned property.

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…

I thought this was the South Side of Chicago.