An Arlington, Va.-based conservative group, whose existence until now was unknown to almost everyone in politics, raised and spent $250 million in 2012 to shape political and policy debate nationwide.

The group, Freedom Partners, and its president, Marc Short, serve as an outlet for the ideas and funds of the mysterious Koch brothers, cutting checks as large as $63 million to groups promoting conservative causes, according to an IRS document to be filed shortly.

The 38-page IRS filing amounts to the Rosetta Stone of the vast web of conservative groups — some prominent, some obscure — that spend time, money and resources to influence public debate, especially over Obamacare.

The group has about 200 donors, each paying at least $100,000 in annual dues. It raised $256 million in the year after its creation in November 2011, the document shows. And it made grants of $236 million — meaning a totally unknown group was the largest sugar daddy for conservative groups in the last election, second in total spending only to Karl Rove’s American Crossroads and Crossroads GPS, which together spent about $300 million.

Cuccinelli for Governor has already received a $50,000 contribution from a Koch controlled corporation and $35,000 from Koch Industries directly. Koch Industries has also contributed $7.500 to Cuccinelli for Attorney General and Cuccinelli for Senate received $2,250. [Huffington Post, Cuccinelli for Governor VPAP, Cuccinelli for Attorney General VPAP, Cuccinelli for Senate VPAP]