I'm not sure how to identify the degree of media bias, but I agree with Jonah that both writers and readers are selective in what they want to report/see and that creates imbalanced coverage.   Tying to identify 'them,' the people that direct what gets printed, would be a great investigative story.   The real decision makers are not the reports that present the news, it's management and ownership(if active), that set the parameters of what get's printed.

Jonah makes the same mistake by the way.   I don't read all of his columns, but I don't ever remember seeing him write about the most watched cable news broadcast in the country, Fox.   Maybe not a good time to bring it up, but Ailes fall from grace has exposed a very seedy underbelly of Fox that no doubt affected who they hired, how they chose to 'sell/market' their news and what got broadcast.     I have zero doubt that Fox was heavy Republican that.   Does anyone doubt talk radio is conservative?

Good for Jonah to point out bias