PBS? Nonpartisan? That'll be news (so to speak) to 80% of the people in the country, the other 20% being those who think nonpartisanship means conformity with their own views.
The only way to get a semblance of balanced facts is to take in a balanced set of sources, and to keep changing it as the political hawksters constantly adjust their marketing messages to the new public reading habits they are constantly measuring. Review both Fox and NBC, Spectator and the New York Times, Drudge and Politico.
That being said, the single most balanced Internet source for analysis is, IMO, Real Clear Politics. That's how they do it, tending to post sources in pairs, one from the left or demwits, one from the right or retardicans. If you're literate and informed, you can usually gain a better perspective on the issues by averaging the propaganda. Of course, if you're illiterate and uninformed, which describes most of the sheep, then you may as well stick with sources that reflect your own prejudices. Bigotry can be warm and comforting, so if there's no hope for you enjoy it while you can.