I can answer that question

Benjamin Ginsburg asks in the WashPost “Why aren’t the media scrutinizing lawyers and advisors to Kerry?” in connection to various 527 groups. There’s approximately a 2-4 week delay before the MSM is made conscious of its own bias. During this gestation period, the blogs do all the heavy lifting (research, commentary, links) on a particular story. Around the time the MSM decides to cover that story, all this blogged data is available on Google such that the “professional” journalists don’t have to do any real work at all. What a country!