Clinical observation:

But Politico’s traffic losses appear to be part of a year-long trend on the  political left. Media Matters For America’s website, for instance, lost 56.83  percent of its unique visitors between November 2010 and November 2011. In the  same 12-month period, Talking Points Memo lost 41 percent, Wonkette was down by  32 percent, Gawker declined by 31 percent, Salon decreased by 22 percent and  progressive blog Daily Kos shed 18 percent of its unique visitors.

See, Site∙me∙ter∙en∙freu∙de, noun,

“deriving pleasure from the failure of other bloggers to generate traffic”

See also related conditions, Blogger Mood Disorder, Bloggernoia.