Anyone who considers Fox news mostly "fair and balanced", does so because they play to their right leaning bias, just as anyone who considers MSNBC mostly "fair and balanced" does so because they play to their left leaning bias. Both networks have a few commentators on the "other" end of the spectrum, but for the most part they play their roles pretty consistently. I consider CNN to be the most unbiased network for news, but I am sure to be corrected by those who disagree.