Public Radio is painfully liberal in some aspects. I work in the smart grid industry, so I have a podcast with all of NPRs energy stories, and 90%+ are favorable to green energy, solar energy, wind energy - and Anti-Coal/Carbon products.
Now, as it turns out, that happens to be my sweet spot, so I love listening to the echo chamber - but I realize there is a HUGE sector of society (perhaps enough to elect a president) that believes in Carbon/Coal/Oil/Pipelines as the foundation of the US energy economy. Those views, as a policy, are severely under-reported on NPR.
Now - I listen to NPR because I believe those alternative views are inane - but that doesn't stop me from recognizing NRP's bias.
Unfortunately, these days, people are so used to having their own (biased, in almost all cases) views dished back to them, that an unbiased news source is unlikely to garner much in the way of attention.
That's fine with me - I can live without stories of the Rapture, government taking our guns away, welfare queens, communist (muslim now?) menace, etc... I'm comfortable in my little liberal shell.