Three internet law scholars affiliated with Yale's Infomation Society Project have analyzed ideological and technological patterns among political blogs.

[P]revious empirical studies of the United States political blogosphere have found evidence that the left and right are relatively symmetric in terms of various forms of linking behavior despite their ideological polarization... In this paper, we revisit these findings by comparing the practices of discursive production and participation among top U.S. political blogs on the left, right, and center during Summer, 2008. Based on qualitative coding of the top 155 political blogs, our results reveal significant cross-ideological variations along several important dimensions. Notably, we find evidence of an association between ideological affiliation and the technologies, institutions, and practices of participation across political blogs. Sites on the left adopt more participatory technical platforms; are comprised of significantly fewer sole-authored sites; include user blogs; maintain more fluid boundaries between secondary and primary content; include longer narrative and discussion posts; and (among the top half of the blogs in our sample) more often use blogs as platforms for mobilization as well as discursive production.

Here is a slanted write up in The Nation. Are we to be surprised by these findings? I don't think so. This fits with the populist and Progressive traditions that are strong in the American left, and the monarchical tradition that is stronger on the right. The paper is more about advancing the tools with which we analyze the Internet especially the blogosphere. By the way, a quick glance at the appendix reveals no economics blogs are in the study.