Democratic presidential candidate Lincoln Chafee, the former Rhode Island governor, just gave one of the worst answers in presidential debate history.

It happened after CNN moderator Anderson Cooper questioned Chafee — who has attacked Hillary Clinton for backing Wall Street — about his vote for the repeal of Glass-Steagall in 1999. Glass-Steagall was a financial-regulation bill that separated commercial banks and securities firms.

Chafee's answer? "The Glass-Steagall was my very first vote, I'd just arrived, my dad had died in office," Chafee said. "I just arrived to Senate. I think we get some takeovers and that was one. It was my very first vote, and it was 95, 90 to 5. The record."

Cooper didn't think the answer was satisfactory. "With all due respect though, sir, what does that say about you that you cast a vote for something you weren't really sure about?" he said, implying that Chafee didn't understand the bill before voting on it.

Chafee replied that he thought Cooper was being a little rough, but essentially acknowledged he had no idea what he was voting for.

Story by Allan Smith and editing by Kristen Griffin