I spoke on the phone with President Rouhani of the Islamic Republic of Iran. The two of us discussed our ongoing efforts to reach an agreement over Iran's nuclear program. While there will surely be important obstacles to moving forward and success is by no means guaranteed, I believe we can reach a comprehensive solution.

In the course of a healthy debate, we prioritize different goals, and the different means of reaching them. But without some common baseline of facts, without a willingness to admit new information and concede that your opponent might be making a fair point, and that science and reason matter - then we're going to keep talking past each other, and we'll make common ground and compromise impossible.

This kind of gaping inequality gives lie to the promise that’s at the very heart of America: that this is a place where you can make it if you try. We tell people - we tell our kids - that in this country, even if you’re born with nothing, work hard and you can get into the middle class. We tell them that your children will have a chance to do even better than you do. That’s why immigrants from around the world historically have flocked to our shores.

If we don't reform how healthcare is delivered in this country, then we are not going to be able to get a handle on that escalating healthcare costs.

I was raised by a single mom who had to put herself through school while looking after two kids. And she worked hard every day and made a lot of sacrifices to make sure we got everything we needed. My grandmother, she started off as a secretary in a bank. She never got a college education, even though she was smart as a whip. And she worked her way up to become a vice president of a local bank, but she hit the glass ceiling. She trained people who would end up becoming her bosses during the course of her career.

One of the brightest lights of our time-a brilliant writer, a fierce friend, and a truly phenomenal woman.

If war explodes in Sudan, it could have a destabilizing effect that creates more space for terrorist activity that could eventually be directed at our homeland.