Here is another in my occasional traffic ranking updates. Using the blogad traffic rankings as my source (since these involve money, as far as I am concerned no other ranking system matters), I have produced a list of the fifty most trafficked partisan, political blogs that can be considered part of a larger leftist or rightist network. In other words, in order to be included in these rankings, a blog must meet all of the following criteria:

• The main focus of the blog must be related to politics (thus, sites such as Blogcritics are not included).
• The blog must have a blogroll, or at least frequently quote from other political blogs, or else it is not considered to be participating within a larger network (thus, sites such as Metafilter and Roger Simon are not included).
• The blog must be partisan in favor of either one major party or the other. This can be determined by either the content of the site or the links on a blog roll. (This eliminates sites such as Wonkette, considering their bipartisan blogroll, and Hit and Run, considering their preference for the Libertarian Party).

Of the top fifty blogs that met the above listed criteria, twenty-six were on the right, and twenty-four were on the left. These twenty-six right-wing blogs combined for 6,077,648 page views per week, while the twenty-four left-wing blogs combined for around 7,918,437 page views per week. This is a roughly a four to three margin in favor of the lefty blogs, which has consistently been the margin between the two groups since I started these rankings in September. As a whole, these blogs receive more traffic than the websites of CNN, MSNBC and Fox News combined. By the 2008 election, blogs might become the number one online source of news for Americans. The rankings are in the extended entry.