The issue I take with this is that employment becomes a form of restriction of free speech. Unfortunately, the reality is most of us can't afford to truly speak our minds because we need a job to put food on the table and a roof over our heads. Still, even with that in mind, I think the best compromise is to provide strong support of your opinions and not just shout whatever political slogan happens to be in vogue.
Honestly if you're going to(hypothetically) rant over the economic system from an extremist viewpoint(like many people on the internet do) i won't be surprised nor blame the employer for not giving you a job in that exact economy you just spent 2k words ranting about; and you shouldn't neither, if you have any integrity that is. Free speech doesn't mean denying any responsibility over what you say, so if an employer refuses to give you the job over some rational reason regarding what you wrote(e.g. hypocrisy in the example before) i really don't think there is anything wrong with it.
Obviously i'm not saying there are no employers discriminating candidates for a political view which may have nothing to do with the job itself, or that they aren't a problem, but i don't think the number of employers that are actually problematic are enough to say that they restrict your freedom of speech. Just find another, and if you can't, well then it's probably on you more so than the employer.
