Barack Obama: “This is something that will save children's lives.”

Your task is not to impose litmus tests.

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.

While we are non-partisan, we are not value-neutral. We have a point of view.

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…