In advance of the Tuesday night Democratic debate, CNN invited Glenn and other recognizable figures to submit a question for the whole group of candidates.
On radio Tuesday morning, Glenn shared with listeners the question he chose to submit and why.
"Can you tell me the difference between a Progressive and a Social Democrat? And tell me the difference between those two and a Constitutionalist," Glenn said.
Watch the clip below to find out what Democratic candidate Bernie Sanders said, which prompted this question.
Below is a rush transcript of this segment, it might contain errors.
GLENN: Hillary Clinton says she's an early 20th century progressive. Bernie Sanders says he's a social Democrat. Can you tell me the difference between a progressive and a social Democrat, and tell me the difference between those two and a constitutional. Maybe I should rewrite that question for them to kind of dummy it up a little bit for them.
But, I mean, she has said she is an early 20th century progressive. He's just come out recently and said, "I'm a social Democrat." I don't know if the average person knows what those two mean. And I can't tell you what the difference is between a social Democrat and a progressive, and I've studied progressives. What's the difference between the two? And what's the difference between a social Democrat and a regular Democrat?
PAT: Yeah. It's worse than social Democrat, it's Democratic socialist.
GLENN: Ah, you're right. You're right.
PAT: Which is right?
STU: Another question I would like -- asked. This is the type of things they would do to Republicans, but on the other side. Do you think it should be legal to abort a baby one minute before birth? And if not, when is the line? I would like to know --
GLENN: They'll never ask that.
PAT: No, they won't.
STU: But that's the exact type of thing they do with rape and incest. Here's the biggest outlier, the smallest percentage of abortions, can you defend that position? You know, the worst possible crime, would you still say no to abortion.
GLENN: Yeah. John Wayne Gacy walks in. And he's -- he needs to buy a gun. But you don't know it's John Wayne Gacy.
GLENN: Do you sell him the gun?
GLENN: What? No. Well, of course, it's John Wayne Gacy. So, but you don't know that. Okay. So I don't have a problem. So you're fine with him going and molesting and murdering children?
STU: Right. That's what they do. And I want to see Hillary Clinton come out and say, yes, one minute before birth, you can abort that baby.
PAT: She would never say that. She would turn it around on Republican positions.
GLENN: The only one I'm interested in hearing is Bernie Sanders.
GLENN: I'm really interested in hearing Bernie Sanders. Do you have any of the audio? I didn't hear it yesterday.
STU: You want his album?
PAT: Oh, his songs are good.
GLENN: I got it. I don't want that. No.
PAT: Are you sure?
GLENN: Yes, I'm positive. What I'm looking for is where he's talking about being a social Democrat.
PAT: Yeah, Chuck Todd asked him about it the other day.
CHUCK: You joked about the idea when people call you a socialist, you say, yes, I'm going to make everybody wear the same color pajamas.
BERNIE: Especially you.
CHUCK: Especially me.
BERNIE: I have a pair of pajamas just for you.
CHUCK: I hear you. And then the other day, I noticed you said, you know what, don't use the word "socialist." I'm going to say I'm a progressive. Are you pushing back on that? Are you embracing, I'm a European socialist?
BERNIE: No. Look, when one of your Republican colleagues gets on the show, he'll say, are you a capitalist? Have you ever referred to them as a capitalist?
CHUCK: Yeah, are you a capitalist?
BERNIE: No. I'm a Democratic socialist.
PAT: Jeez. Isn't that amazing?
BERNIE: But what I mean, I've been elected as an independent throughout my political career. I am running now in the Democratic nomination process and will support -- I hope to win. I expect to win.
CHUCK: But you'll support the Democratic nominee?
BERNIE: I will.
GLENN: No. We can't have a president that sounds like you, Bernie. Your policies could be horrible; they could be wonderful. Most Americans will not get that far.