I used to watch Cronkite. He was a lefty, alright, but he rarely let his philosophy bleed into his job.
Regarding the left and right media, there's nothing wrong with watching Fox News. You may find the news analysis shows objectionable, but the news is only the news on Fox affiliates, just like on most of the other networks' affiliates.
Of course, the news they leave out can be illustrative of some bias...