Ira Stoll pushes back against the anti-Koch brigade:

The Times could write a story headlined Billionaires' Money Plays Role in Wisconsin Dispute and have the article be about not the Koch brothers but about the funders of Common Cause. But the left-wing interest groups rarely get that kind of treatment in the Times, where these left-wing interest groups are more commonly quoted approvingly as expert sources rather than scrutinized skeptically or suspiciously as targets.

I think he has a point, don't you?