I agree that most public radio and TV reporting and analysis skews left, and thus appeals to more liberals than conservatives.  But EVERY government-funded program has some degree of similar biased appeal: just contrast the supporters of the military vs. social welfare.  And I suspect the $500 million spent on the CPB is about the same as federal spending on programs that support hunting.  Probably not too much overlap in those user groups, but maybe some equity in spending.

If we defunded everything with some degree of political bias, we could probably cut the federal budget by 99%.  But we would no longer have a functional country, at least not for long.