At a campaign stop in Texas on Monday, Joe Biden made what Grabien called "easily his biggest blooper of the 2020 campaign season."

Trying to quote the preamble to the Declaration of Independence — some of the best known words in all of America's founding documents — Biden stumbled badly, seemed to forget, and said, "You know the thing."

Video:

"We hold these truths to be self-evident ... all men and women created ... by ... go ... you know the — you know the thing."

Full video for context; relevant remarks start at 54:50:

➡️ Go further: Biden, 77, becomes youngest male candidate in Democratic primary