Thing is, the man was never that bright.
Excellent point. He has plagiarized often over the years. He fills in the blanks with lies and tall tales.
One of my favorites is he said Amtrak gave him the keys to the locomotives so he could drive them. Biden said when he takes the train, he rides in the cab with the engineer.
Another ridiculous tale is that he was a trucker and used to drive the "big rigs".