Rush is fine just the way he is.
Cyborg touches on a very important point.
Each of these hosts has a distinctive style that is part of his or her market appeal. Laura Schlessinger is the strict mom who doesn't mess around when dispensing practical advice, for example, while Laura Ingraham is lighter, floatier, more political and more interested in entertainment news and views. That she and Michael Medved digress into discussing current movies is perfectly defensible as germane, because movies -- like the plays of Terence, Plautus, Shakespeare, Thornton Wilder, David Mamet, and Aristophanes -- put ideas and the consequences of ideas squarely before the public.
Even Gilbert and Sullivan had something important to say about personalism, cronyism, and honesty in public life; far from just musical comedy, Gilbert and Sullivan's plays have been recognized as the first really "high comedy" since the Golden Age of Greece. It would have been impossible for anyone to comment on The Pirates of Penzance, when it was first mounted, without uttering a form of political speech: Gilbert and Sullivan's kind of comedy was almost the exact opposite of Seinfeld.
Finally, each of these radio hosts has the right to offer his or her unique point of view. If someone out in the audience doesn't care for the show, then that is the audience member's business.