As horrendous as Rush is, as appalling as I believe his recent comments to be, he has the right to spew them. I disagree with any petition to ask the FCC to intervene to silence him. The ad boycott has been far more effective in exposing Limbaugh's shallow-gene-pool misanthropy in general and misogyny in particular.
He has seen a short-term bump in his ratings, much like fools rubbernecking a fatal accident, but over the long haul, he'll wither and drown in his own fetid swamp of corpulent flopsweat.
Don't throw him a life preserver when he's already drowning.