Judy Woodruff:

It is here at last, John.

We are so glad to be here at Loyola Marymount University in Los Angeles.

We are — and, by the way, there will be a third moderator tonight, Tim Alberta of Politico. He will be joining us, along with Amna and Yamiche.

But, John, tonight we're — first of all, we're glad it's happening, because there was a labor dispute. We're happy to report that's been resolved.

We can also say that the rules tonight are pretty straightforward. The candidates will have a 1:15 to answer the questions, about 45 seconds for follow-ups and so on, so pretty typical in terms of how the debate goes.

But there are some differences tonight.

Amna, this is the first debate with just seven of the Democratic candidates.