The final question of the night is all about unusual friendships.
CNN's Anderson Cooper brought how Ellen DeGeneres and George W. Bush were spotted at a football game together. DeGeneres faced criticism for being friends with the conservative former president — in response, she said, "I think that we've forgotten that that's OK that we're all different."
"So in that spirit, we'd like you to tell us about a friendship that you've had that would surprise us and what impact it's had on you and your beliefs," Cooper said.
Here's how each of the 12 Democrats responded:
- Julián Castro said "Some of the most interesting friendships that I've had have been with people different from me, either people older than me that had a lot to teach me, or people who grew up very different from me."
- Tulsi Gabbard mentioned former GOP Rep. Trey Gowdy. "He and I disagree a lot and very strongly on a lot of political issues. We've developed a friendship that's based on respect, and he's been there for me during some personally challenging times."
- Amy Klobuchar: "For me, it's John McCain, and I miss him every day."
- Tom Steyer: "So I'm friends with a woman from Denmark, South Carolina, named Deanna Berry, who is fighting for clean water and environmental justice in her community. She's a different gender. She's a different race. She's from a different part of the country, but she reminds me of my parents in terms of her courage and her optimism and her honor."
- Beto O'Rourke told a story about how he and GOP Rep. Will Hurd drove from Texas to Washington after a snowstorm. "Drove 1,600 miles across the country. Live streamed the conversation. A Republican and Democrat finding out what we had in common. By the end of that trip not only had we formed a friendship, but we had formed trust."
- Andrew Yang said he became friendly with Fred, an avid Trump supporter who is a trucker and spent time in jail. "I heard about his experiences trying to get other people off drugs. And I'm happy to say that after our ride together, he actually said he would move from Donald Trump to my campaign, which was a thrill for me. And we remained in touch ever since," he said.
- Kamala Harris said she's friends with GOP Sen. Rand Paul, and she once invited him to join her on a bill to end the money bail system. "He and I agree on almost nothing — but we agree on that."
- Bernie Sanders said he worked with John McCain on a veterans bill. "I did not get in the legislation working with McCain all that I wanted. But it turned out we were able to pass a very, very significant piece of legislation including $5 billion more for the veterans administration."
- Pete Buttigieg said he formed friendships with people in the military who were radically different from him. "When they got into my vehicle and outside the wire, they didn't care if I was going home to a boyfriend or girlfriend. They didn't care what country my dad immigrated from whether he was documented or not. We just learned to trust each other."
- Elizabeth Warren said former Solicitor General Charles Fried, a Republican, once helped her get a job. "We didn't agree on much — I was far more liberal than he was. But he also was willing to listen to my work about what's happening to America's middle class. And Charles engaged with it over and over and is the person who made sure I got the job.
- Joe Biden said he became close friends with Sen. John McCain after they traveled the world together. He described McCain as honorable and "a great man of principle."
- Cory Booker: "I was the mayor of large city with a Republican governor. He and I had to form a friendship, even though I could write a dissertation on our disagreements."