Angelo Carusone thinks Bill O’Reilly’s days at Fox News are numbered.

It’s a notion that would have seemed far-fetched even a few days ago, and most industry observers remain highly dubious. But Carusone isn’t just shouting into the wind: He has done it before.

RELATED: Media Matters Hires Angelo Carusone, Leader of ‘Stop Beck’ Movement, to Ramp up Campaign Against Fox News

Carusone, the president of liberal media watchdog Media Matters for America, is one of the main organizers of the #StopOReilly campaign, which is pressuring businesses to pull their ads from “The O’Reilly Factor” in light of sexual harassment allegations against the popular Fox News host.

RELATED: Media Matters Executive Behind ‘Stop Rush’ Campaign Blogged About ‘Trannies,’ ‘Homos’

He also was the organizer of Media Matters’ successful campaign against former Fox News host Glenn Beck, and another campaign that succeeded in needling Rush Limbaugh.