Barack Obama: “I deeply regret the tragic accident in Kunar Province.”

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.

The success of this experiment was never a given.

It's a way to honor her trailblazing leadership, and inspire visitors to follow in her footsteps.

There’s no doubt that we are going through a period right now of disruption, polarization.