(NEWSER– Was the advertiser boycott over Rush Limbaugh's "slut" comment last year behind a slump in ad sales at the broadcaster that carries his show? The host is so outraged by the mere suggestion that he's threatening to leave flagship station WABC and its parent company Cumulus Media, sources tell Politico. If Limbaugh does leave Cumulus, 40 stations in 36 markets would lose the rights to his show, creating a huge talk-radio shakeup as he seeks replacements.

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