I'm really not sure the video shows Limbaugh mocking Fox."

I think John Hardly is being very very charitable towards Limbaugh there. If wobbling about like that and saying "It's truly an act" isn't mocking... Well, maybe a precise description of what he was doing is to say he was "sneering at" Fox.

I'm not that keen on this particular version of stem cell research, myself. But where people stand on that issue should hardly be relevant when it comes to this type of conduct by a broadcaster. Not unless you think it's right to subordinate your principles to your politics.