An interesting article on conservatives in talk radio.
In part it says:
Talk radio shows how profoundly the FCC's repeal of the Fairness Doctrine has affected political discourse. In recent years almost all nationally syndicated political talk radio hosts on commercial stations have openly identified themselves as conservative, Republican, or both: Rush Limbaugh, Michael Medved, Michael Reagen, Bob Grant, Ken Hamblin, Pat Buchanan, Oliver North, Robert Dornan, Gordon Liddy, Sean Hannity, Michael Savage, et al. The spectrum of opinion on national political commercial talk radio shows ranges from extreme right wing to very extreme right wing - there is virtually nothing else.
On local stations, an occasional nonsyndicated moderate or liberal may sneak through the cracks, but there are relatively few such exceptions. This domination of the airwaves by a single political perspective clearly would not have been permissible under the Fairness Doctrine.