And that, I suppose, is what I'd been trying to tell my mother that day: that her faith in justice and rationality was misplaced, that we couldn't overcome after all, that all the education and good intentions in the world couldn't help you plug up the holes in the universe or give you the power to change its blind, mindless course.

Each and every time, a new generation has risen up and done what’s needed to be done. Today we are called once more — and it is time for our generation to answer that call. For that is our unyielding faith — that in the face of impossible odds, people who love their country can change it.

This massacre in Orlando is therefore a further reminder of how easy it is for someone to get their hands on a weapon that lets them shoot people in a school or in a house of worship or a movie theater or in a nightclub. And we have to decide if that's the kind of country we want to be. And to actively do nothing is a decision, as well.

The changes in thinking about same-sex marriage have come slowly at first and then in rapid course. If such change is possible in this area, is it also possible in the vexed and sordid realm of race relations?

We've come to be consumed by a 24-hour, slash-and-burn, negative ad, bickering, small-minded politics that doesn't move us forward.

It's not a nice-to-have - it's a must-have. It's time we stop treating child care as a side issue, or a women's issue, and treat it like the national economic priority that it is for all of us.

I think we need missile defense. But I want to make sure it works, that it's cost effective, that the technologies are operable, that it's our best possible strategy, and that hasn't been shown.