I have no doubt Rush used FR for some of his show prep. Too many times a Freeper would post an off beat idea/perpspective in a thread and Rush would voice it.
Rush was a regular viewer here, or he had staff people monitoring. I also saw some direct adaptations of comments made here. Quite an honor imo.
Yes, he used FR. During the Obama years my Tagline was: "I don't oppose Obama because his skin is too brown, but because his ideas are too red".
I sent him an email and told him I was honored that he used, but I do think he should've given me credit. I never heard him say it again. Pity. It's a great line and full of truth.