That sounds like a college textbook my daughter had in 2005 or so. The introduction cautioned the students about committing plagiarism and gave a contemporary example of a known plagiarist, then senator Joe Biden.
I so badly wish we still had that book.
Reminds me of another pice of accidental jornolism that has completely disappeared from all web searches and archives - the brilliant investigative piece in 2007 by writers for Vanity Fare about the rise of a certain Barack Obama. At the time VF was pushing Hillary so I am sure the research came from Clinton Reseach Teams. It was a bombshell that should have taken him out in 30 freaking seconds