I missed this from biz school prof Kevin Dooley back in August, 2008:
[H]ow are political blogs the same or different from MSM? Through Wonkosphere, we have noticed that political blogs are consumed in much the same manner as mainstream media is, which indicates that readers treat political blogs not as separate from, but rather as part of, mainstream media. Wonkosphere traffic is greatest on Monday, and tends to peak before breakfast, lunch and dinner, i.e. when people are cruising on the net to end a portion of their work day. Blogs act as newspapers for most. Continue reading