It's sort of a dystopian fantasy that I don't really believe will actually happen, but you can easily picture the natural endgame for this sort of behavior. Much like union & non-union shops, you wind up with conservative & liberal companies. Not just companies that tend one way; companies that say "You want to work here? I'm sorry, I see you voted for Reagan, goodbye," Signs that read, "Liberals need not apply".

(Again, I know this is wild & somewhat exaggerated)