Barack Obama: “The challenges of our young century can only be met through partnership.”

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

Now the ball’s in your court, Iowa.

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.

Your task is not to impose litmus tests.