News, Newspapers, Websites, Radio, TV, and organizations that convey information the public.
Starting a section on MSNBC and their bias is like starting one on listing all the names in the Holocaust. This is a Sisyphusian task to try to create a comprehensive list -- so I won't do that. Heck, it'd be impossible to list all the failures of any on of their personalities alone (Ed Shultz, Chris Matthews, Tom Brokaw, Mika, Maddow, and the other Hurricane Katrina's of journalistic ethics). So I'll just cherry pick, and offer a few nuggets, links to aggregate sources, greatest misses, and things that can point out the obvious to those capable of getting it.
Media Matters: the big lie -- it's a hit list for David Brock's political enemies, masquerading as a 501c.
David Remnick took over as Editor and they became the cheap partisan low-quality mock-worthy rag that they are today. This details just a small portion of that.
Politico started when left-of-center John F. Harris, and the slightly less left-of-center Jim VandeHei (who left to found Axios in disgust, and penned a FU I'm outta here letter), got funding for a DC tabloid journalism (rumor mongering) on the DC set. Sort of what HuffingtonPost was to Hollywood, but only for DC, if HuffPo had even lower ethical and journalistic standards. The point isn't that I dislike Politico -- its looser quality controls allows for some people to get a voice that they wouldn't have elsewhere. So to me, it's like reddit or twitchy -- sure most articles are full of shit, but they allow both sides turds, and you can find some treasures in the sewage, if you are willing to wade long enough.
Skeptical Science is a FakeScience site created by not-a-scientists John Cook. It seems like his name is missing an 'r' somewhere. He created his site not to inform people, but to misinform them. You can tell by things he does on it: like omitting facts that he finds inconvenient, or censoring famous Climate Scientists that he disagrees with. It's fine that he has an advocacy site -- it's wrong that he plays it off as a Science site. Science is always about facts and skepticism.
Time Magazine was once a respected publication, but like all things: liberals ruined it. Once they took over, they destroyed "journalism" and replaced it with propaganda. So while good articles occasionally get through their editorial bias, it's strictly by accident, and usually not touching anything vaguely political.