It's not just the rags. Most news organs are heavily biased against conservatives.
For instance, there's a CBS news site in Wisconsin I regularly visit.
The site has an opinion section with several...uh...opinionators.
They're all hard, hard liberals with never a good word for any conservative or Republican.
In short, average Americans who seek info on the issues are overwhelmingly deluged with lib/leftist propaganda.
The sin is that most of them don't realize it. They think they're getting unbiased news.
I remember reading somewhere that lib media propaganda gives lib candidates a ten percent edge over conservative candidates every election. I believe it.