Sorry, that doesn’t wash. Hannity, Limbaugh, and Levin all talk about and promote each other. Mainly because they are friends and probably because they all belong to the same syndicated group. Coulter, Limbaugh, Levin, Hannity, and Ingraham all promote and push the other’s books. Only Ingraham pushes a book by Beck. Beck is taking a lot of the stuff mentioned first by Levin and then by others and expanding on it - drawing diagrams, putting faces to names, etc.
Baloney -- Glenn was provided with the video of the ACORN stings, the damning pieces of Van Jones and Anita Dunn by Andrew Brietbart himself, he didn't draft off of others. You can leave Rush out of the mix, Hannity and Levin are another story, one told by the ratings, viewers and listeners.