I guess I am more cynical than most. I think a good deal of spin doctors and talking heads would switch sides for a bigger paycheck. But that's not just Fox network either.
I agree, obviously! These people are "stars". Their livelihood depends on viewership, and the owners of the networks will shift accordingly. If "liberal" ideas sell, then it's liberal ideas they'll sell. The rightwing nutbars are small in number but very vocal - only it's numbers that count in the end.
Like, for instance, TV shows that appeal mostly to people over 40. They outnumber nearly everyone else, but the networks and movie makers, etc., know who does the most "discretionary" spending and it's that demographic that drives the market. Over 40? You're a past number. You buy denture glue and Viagra, not I-Pods and such.