That's from 2005 though, I think the slant on both sides has gotten more intense in recent years.
I agree.
I think it's a lot to do with rapidly increased source, speed of information exchange. Once a journalist/reporter would have to do an immense amount of involved legwork. That's changed. A tweet becomes news. Pressure on media to break a story has completely changed (increased) and continues to. Bloggers becoming "news source. There are goods in the new dissemination of information, but also many bads.
Also I see an increasing
desire for biased "news," and an entertainment crossover. Folks complain about bias, yet they (we) obviously want it. Otherwise, Glenn Beck, Rush, Rachel Maddow, Jon Stewart wouldn't be as immensely popular as they are. Complain as we might, we don't just want the facts, we want confirmation (or clear dispute, which essentially amounts to confirmation).
Also, I believe there's a sense in the viewer that they (we) actually fully understand, when we don't. I mean, this Walesa thing that's in the news... I'd be surprised if 10% of folks reading the stories previously had any idea whatsoever of who Walesa is. But immediately, everyone is an expert. Within hours, everyone's an expert. Egypt. Greece. The Euro. The recession rate of Greenland glaciers. Lech Walesa. And in a few days, we'll be experts in something new. It's interesting looking through TOL news-related threads from a few years ago, to get a sense of our being experts on topics and dropping them within weeks.