Journalists are supposed to be the people that question assumptions, but they’re just as stuck in a worldview as everybody else — especially on political issues. As a commenter notes, the illustration is similar to the Overton window.
The essay’s title is derived from the idea that people are increasingly interconnected and more able to find new information sources: that is, we are becoming de-atomized. It’s not surprising that the web (particularly blogging) is undermining the authority of old-media journalists. What does surprise me is that this is presumed (oh ho!) to mean that it’s becoming harder to maintain a stranglehold on acceptable viewpoints, even though there are massively popular political sites. The power centers are changing, but are the perspectives?