Nobody can ever tell me the answer to that.
I’ve heard Levin rant about it in a childish and pathetic manner many times and never got an example from him either.
When Beck came out with his book on “Common Sense” that is when this started and I would listen to Mark and wonder except for Mark personal legal knowledge (which Beck ever talked about) everything else was public domain.
I still could never figure out what it was that Beck took from Mark!
And when you think about it I don’t think there wasn’t enough hours to get stuff for a radio and TV shows and all the books he read and of course his family life so where would he get the time to listen to Mark?