I don't care one way or the other about this article. The author refers to the Center for Responsive Politics (CRP) as "a respected nonpartisan nonprofit". But when I go to that group's website, I found that it received $400,000 from the Ford Foundation, $350,000 from Open Society Foundations (Soros), $150,000 from the Rockefeller Brothers Foundation, $50,000 from the Jennifer and Jonathan Allan Soros Foundation, an undisclosed amount from the Tides Foundation (Soros), $400,000 from the MacArthur Foundation, and money from other groups that could be Soros' front organizations.
Then I see that the Sunlight Foundation gets its resources from some of the same groups: the Ford Foundation, the Open Society Foundations (Soros), the Rockefeller Family Fund, the Foundation to Promote Open Society (Soros), the Open Society Institute (Soros), and so on. Its biggest contributor is the eBay billionaire Pierre Omidyar, through his Omidyar Network; Omidyar appears to take direction from George Soros, donating lots of money to groups where Soros has given smaller amounts.
Sunlight also calls itself a "nonpartisan non-profit", and that is true, but also irrelevant. The CRP and Sunlight Foundation promote a hard-left agenda -- the agenda of George Soros; they do not have to give money to politicians to have an impact on politics. And I'm certain they had no trouble getting or keeping IRS approval for their 501(c)3 or 501(c)4 tax-exempt status.