by Nicholas Beaudrot of Electoral Math
This graph from Nielsen's blogpulse shows the rate of blog posts that mention top tier '08ers. It tells a sad story about the state of political blogging.
Hillary Clinton's trend line shows two local peaks; her announcement on Januray 20th, and the recent Obama-Geffen-HRC dustup.
Obama's trend line shows five peaks; one for his exploratory announcement, one for Hillary's announcement, one for what I think is the bogus "madrassa" story Joe Biden's "clean" gaffe, one for his official entrance, and a fifth for the aforementioned dustup.
Edwards' trend line is harder to visualize, because his peak is much lower than Clinton's or Obama's. But if you look at it on its own you'll find five peaks; his announcement, a secondary bounce for Hillary's announcement, the Amanda Marcotte Saga, Amanda's resignation, and another recent boost along with Obama & Hillary when David Geffen popped off.