On Monday, the National Republican Senatorial Committee went after Montana U.S. Senate Democratic Nominee Jon Tester for his affiliation with the Daily Kos website.

Maybe the criticism is fair game, but the reasons weren't, IMO:

"An anti-Israel diary posted today on radical web site 'Daily Kos' includes the expression 'screw you Israel,'" said NRSC Spokesman Brian Walton. "By continuing to accept Kos' support, using his blog to raise money, and even linking to it from his own site, Jon Tester has assumed responsibility for comments like this. Jon Tester should remove the link to 'Daily Kos' from his site and repudiate Kos' hate-filled politics

The criticism of blogs and websites being attached to their readers is nothing new.  Little Green Footballs, Atrios, Wizbang, and others have been unjustly criticized due to the statements of those who visit or are members of their websites. 

The attack on Tester, and indirectly, Kos, by the NRSC is cheap.  Attacks like these do nothing but encourage bloggers not to have comment sections or other interactive material on their sites.  That also hurts the spread of ideas and expression, a couple of things that the blogosphere excels at.  The blogosphere gives people a voice that they more than likely didn't have before. 

I find it ironic that it's usually the bloggers or other entities that seldom provide any kind of voice for its readers that tend to criticize the content shown on the sites that do.  God forbid they open up any kind of dialogue to show how potentially ignorant or bigoted their readers are.  If the NRSC provided a chatroom, or a diary site on their website, do they or anyone actually believe that it would be devoid of some very extreme opinions?  I don't think so. 

If the NRSC, or anyone else want to criticize Kos, his website, or people that are linked to Kos, use the blog posts that Kos actually makes, or at least the ones done by his staff (volunteers, or whatever they are).  Believe me, there's plenty of material that you can use.  Kos, nor any other blogger or website that has discussion boards, comment threads, or chatrooms should be held responsible for the views that their viewers/members have.  Hold them accountable exclusively and individually.