In his Monday morning 'apology', Limbaugh suggested Sandra Fluke might have been lying about the examples of women who were unable to get contraceptives, and the consequences to them.
The new 'apology' contained a veiled request for his teabagger/freeper/dittohead army to investigate the examples that Sandra Fluke referred to in her testimony.
He wound that in with accusing her and liberals of manipulating the recent Issa congressional hearings.
By questioning her motives and her testimony he is basically encouraging his listeners to investigate and harass Sandra Fluke and her friends.
It's similar to what he did with Herman Cain's sexual harassment accusers. And what he's done in the past with climate scientists involved global warming research. I think I read that some of those related to the East Anglia "climate gate" event (that he was instrumental in drumming up) received death threats.