CJR, you need to go deeper. You need to backtrack to see how the 'warbloggers' showed up around 9/11. There had already been a surge of right wing sites during the 2000 election ... but post-9/11, the war in Afghanistan and the run-up to the Iraq War created bubble-celebrities. They ignored our existing methods of measuring weblog success, created their own alternate reality.
In this 'warblogger' period, I'd mention I wrote a blog in conversations with strangers. The initial response was, "So you're a Republican?"
Of course, the response nowadays is, "But I thought you didn't have children." The stereotype is that everyone who blogs is a lifestyle- or mommyblogger. I so appreciate the "Nobody reads anymore. You should be on Pinterest!" helpful suggestions.
Later: What bothers me most here is the seemingly larger red blob. We need more center/left blogs. START ONE.