I remember a parody from Rush's show. I believe it was done by Paul Shanklin. Feed Caroline to the tune of Neil Diamond's Sweet Caroline sung by Al Sharpton. One of the funniest I've ever heard. Can't find it anywhere on the web.
Rush's parodies were great. Maybe I'm just tuning in at the wrong times, but I'm not hearing them anymore. I wonder why.
I’m not a Rush 24/7 member (whatever that is), but if you are you can evidently access all of his parodies here:
http://img.rushlimbaugh.com/home/parody.guest.html