CSPAN and the Library of Congress are the only unbiased sources – they're the actual political events and documents with no one interpreting for you.

It's a lot to digest though. As soon as someone is summarizing, some amount of bias is unavoidable. The only solution is to read a variety of sources and do your own critical thinking.

I think Fox is horribly biased. MSNBC is a bit much at times too. Most of the rest of the major outlets – the BBC, NPR, CNN, ABC, etc – are OK if you read from all of them.

TV news is sensationalist with no depth. Read their online versions.