I remember watching Saturday Night Live decades ago, and they were lampooning Joe Biden even then. They portrayed him as an imbecile spouting nonsense. 1990's, 2000's, SNL knew he was stupid and an idiot.
Robin Williams nailed him in 2009...
“Ramblin’ Joe Biden” - Language Warning
https://www.youtube.com/watch?v=jHHUkTRFvew