Following Koch on the AFP Foundation donor list are a number of corporations, including State Farm, which gave $275,000, 1-800-Contacts, which donated $80,000, and Johnson & Johnson and Shaw Industries, which each gave $50,000. Shaw, a carpet and flooring manufacturer, is a wholly owned subsidiary of Berkshire Hathaway, the company controlled (ironically) by pro-Obama billionaire Warren Buffett. Also listed are a number of well-known and deep-pocketed conservative foundations, including the Pennsylvania-based Sarah Scaife Foundation and the North Carolina-based John William Pope Foundation.

The document, a Form 990 Schedule B, is essentially list of the largest contributors to a nonprofit organization, filed annually with the IRS. It's meant to be kept private, with only redacted versions released to the public, but a source retrieved the AFP Foundation Schedule B from a publicly accessible state attorney general's website, where it had been apparently uploaded in error, as has been known to occur on occasion. AFP, a 501(c)(4) group, and its foundation, a 501(c)(3), are legally separate, but they operate functionally as two parts of the same organization, in an arrangement common among political nonprofit organizations.

AFP was started in 2004 after it split "due to philosophical differences" from a predecessor called Citizens for a Sound Economy, which also spun off FreedomWorks, one of the groups currently leading the charge against Obamacare. A separate previously unreported Schedule B from Citizens for a Sound Economy Educational Fund lists a number of big corporate and foundation donations, but records David Koch as the largest funder.

That document, from 2001, states that the David H. Koch Charitable Foundation provided the single largest contribution, $2.35 million, while David Koch personally donated $1 million, and Koch Industries chipped in another $952,500, for a total of more than $4 million.

Corporate donations include $750,000 from General Electric, $275,250 from Exxon Mobil, $255,000 from State Farm, $100,000 from Philips Lighting, and $350,036 from the law firm Wilmer, Culter, & Pickering, now known as WilmerHale. There are also numerous foundation grants, including a $450,000 contribution from the Charles G. Koch Charitable Foundation.

State Farm, the only company listed on both firms, has a history of aggravating liberals, from its refusal to purchase advertising on the now-defunct progressive talk-radio network Air America, to its support for the American Legislative Exchange Council. But in the years since its $275,000 donation to AFP, a spokesperson said, the insurance company has given only an additional $3,500 to Americans for Prosperity. "We support a variety of groups across the political spectrum in the interest of encouraging thorough discussion of issues of concern," State Farm's Anna Bryant said. The other companies did not respond to or declined requests for updated contribution information.