I stopped listening to Rush after he decided not to defend the Constitution while Hussein Obungo usurped the presidency.
I think that's fair. There is a handful of third rail issues that he avoided. He also allowed Arlen Specter come on and mislead his audience on "Main Street Republicans." There are two entities associated with MSR, and only one of them was donating money in support of some DEM policy or candidate. Rush never called out Specter. That one did it for me, lost much trust and another example of the value of knowing on your own, what is really going on.
But also to be fair, no pundit will be perfect, and taking on a third rail issue is a huge risk as far as audience retention, ability to influence going forward. Step too far away from the (false) orthodoxy, and some audience will be lost.
Rush was a gem. The public was lucky to have had him. I didn't listen to him much, but I have great great respect for what he did.