Don’t listen to Sean so don’t ask me to defend him. And I don’t want petty, no.
I did not agree with Mark going public with it, but I do not blame him. If I had worked hard on something for that long, I’d be angry as heck as well, if someone used it without attribution.
As best I can tell, the argument is that Beck used the same two Cass Sunstein quotes, in the same order, as Mark used in L&T. If I remember my college English courses correctly, I was always taught to use primary sources if they are readily available rather than attributing the secondary sources. Why? To be absolutely certain that the information is accurate AND so that it is easily verifiable for the reader.
It certainly is much more authoritative to state "this info was written by Cass Sunstein himself" rather than Mark Levin says this is what Cass Sunstein said.