Washington elites perceive the various aspects of politics as activities for insiders. The rest of us just get to watch some of it and, sadly, go to the polls every now and then. I think it's been a long time since Richard Cohen has seen his audience as the readers of the Washington Post. Instead he imagines he's participating in a conversation by and for elites.
All of that's fine, but it's the type of activity which is much better suited for, say, a blog than the limited real estate space of the Washington Post opinion pages. There are a lot of reasons for declining newspaper circulation, but one which doesn't get enough credit is the general contempt many newspapers seem to have for their readers.