Since examining bias in content is not of itself political.
CNN and Fox are nearly opposite in terms of bias, and both score pretty badly, mixed, in terms of accuracy. Interesting that conspiracy theories seem to be mostly associated with Fox. Is there something political about conspiracies that makes those with right-leaning sympathies more likely to believe them than those with left-leaning sympathies?
Let's look at the research: Not obviously a left/right issue, but extreme left or right beliefs tend to favour conspiracy theory thinking. Maybe it is just a Fox thing. Or maybe this is related to the fact that Fox is closer to extreme Right than CNN is to extreme Left.
Overall, we rate Fox News strongly Right-Biased due to editorial positions and story selection that favors the right. We also rate them Mixed factually and borderline Questionable based on poor sourcing and the spreading of conspiracy theories that later must be retracted after being widely shared. Further, Fox News would be rated a Questionable source based on numerous failed fact checks by hosts and pundits, however straight news reporting is generally reliable, therefore we rate them Mixed for factual reporting.
Overall, we rate CNN left biased based on editorial positions that consistently favors the left, while straight news reporting falls left-center through bias by omission. We also rate them Mixed for factual reporting due to several failed fact checks by TV hosts. However, news reporting on the website tends to be be properly sourced with minimal failed fact checks