The problem here is that you're the one making an accusation of bias, and thus the burden is on you to prove your accusation. Yet you have no evidence to back up what you say. There are gazillions of conservative celebrities out there, and most new celebrities aren't tested or usually don't even talk about their political views.
I know of several successful conservatives in academia, some of which have risen to the very top universities and had many articles published in the very top journals. In fact, I had even talked to one once and he told me that tenure decisions are made mainly based on publication productivity.
And further, not only have you not proven your point, you have not even presented any compelling motivation for discrimination. In the entertainment industry, the determinants of success are clearly based around talent shows, connections with promoters and good looks. The aim is to be a successful industry, just like business, rather than to promote an ideological view. Nor is there any rationale you've pointed out why university faculty in areas ranging from science to math to architecture to public relations all might be subject to political discrimination, as their fields have nothing to do with politics and they need never talk about politics during their entire career. Yet when you look at political donations by faculty they are just as liberal as those in the political science department.
As I said before, we can agree to disagree. I firmly believe that to come out as a conservative in Hollywood or academia before building a name for yourself is the kiss of death. Maybe I'm not right in 100% of the cases, but that's what I believe is largely true.
As far as Hollywood goes, I think the type of fame matters in whether one can "get away with" being a conservative. The examples you gave -Britney Spears and Jessica Simpson - are pop icons who got their fame directly from the public, without having to go through the filter of the studios with their poltical views publicly known. I would bet that they didn't declare their views before they became famous. But if you're looking to break into movies and are unknown, you'd best not declare yourself conservative. It's basically the political version of the casting couch - there are certain things a powerless starlet has to do in order to have a shot at being famous, unless he/she is lucky enough to break out as a public phenomenon, in which case the Hollywood elite loses its power to a large degree.
Universities are notorious for their political backstabbing as well as their intolerance for anything but the "approved" line - which means liberalism. Once a professor has tenure, he/she can be more honest, but before, watch out. If you believe that granting of tenure is based purely on academic achievement, you could also believe in the tooth fairy.
I don't have the time to devote to proving this, so I throw it out as an opinion. Since this isn't a court of law, I don't really have to prove it, and I recognize that you don't have to change your opinion either. But I will continue to believe what I said based on anecdotal evidence that I have seen and heard.
