Liberals' First Amendment: "Anyone who disagrees with us shut the fuck up."
As much as they will try to deny it, the evidence is overwhelming. It's the whole basis of Political Correctness, to choke off unapproved views. Tellingly, venues controlled by liberals, eg universities, mainstream media, government, are notorious for suppressing dissenting opinion, at least if that opinion is conservative.
Fox News has been as big a nightmare for them as Limbaugh. They can't shut them down and they can't force people to stop listening to them. And their attempts to rebut them invariably turn into embarrassing ad hominem rants.