This right here is the single best way I have of explaining what a huge source of political power the netroots - US progressive grassroot blog networks - are: The site statistics for the Daily Kos website, which is sort of the major connecting link between all these blogs. How big is Daily Kos? They get 1.1. million unique users per day.
If we put that into newspaper circulation figures - and, granted, many of those newspapers are read by more than one person, but still - that puts them right between the LA Times and the Washington Post in circulation. That's respectively number 4 and 5 on the list of the largest newspapers in the United States.
I wish the Norwegian left would catch on to this, because the right is doing the groundwork right now.