Iowa GOP State Sen. Sandra Greiner is queen of dark money in USA; in Wisconsin alone, she ran $250,000 of attack ads against gay Rep. Tammy Baldwin

Iowa District 45 State Senator Sandra Greiner,
president of American Future Fund, the third-
biggest dark money 501(c)(4) in the US, swears
on a Bible to support Iowa's constitution and
faithfully discharge the duties of senator. Greiner
was not actually wearing a tiara at the time

In 2012 more than 100 dark money organizations (entities organized as 501(c)(4)'s to hide wealthy donors) collectively spent more than $300,000,000.
     But only three spent more than the Des Moines-based  American Future Fund, whose president is Iowa State Senator Sandra Greiner.
     Last month, Greiner bought more than a quarter-million dollars of Wisconsin television attack ads (watch below) targeting Wisconsin's 2nd District US Representative, Tammy Baldwin, in an failed attempt to derail her successful bid for the US Senate.
     Sara Jerving at PRWatch has demolished the substance of Greiner's TV ad, which was based on so many exaggerations and flawed economic interpretations as to be indistinguishable from a lie: 

A key claim in the ad comes from an Op-Ed article by Jeff Landin of the Wisconsin Paper Council, who used figures from a 2010 study commissioned by the American Forest and Paper Association and Fisher International, a consulting and information services firm to the pulp and and paper mill industry. The ad extrapolates findings of the industry study which noted "at risk jobs" in the Midwest from the regulation. The study, according to Dr. Charles Kolstad, Chair of the Department of Economics at the University of California at Santa Barbara, "purports to estimate the increased costs borne by the industry from the proposed regulation, the number of mills that may be shut‐down from the rule, and the number of jobs that may be lost from the rule. Unfortunately, the methodology is fundamentally flawed in many respects; thus the results reported are useless." He added that "If I were grading this, I would give it an F. The economics is all wrong (lack of an incidence analysis or acknowledgement of its importance; failure to draw on the relevant literature), which of course would be my main concern." Laurie Johnson of the Natural Resources Defense Council echoed this statement: "a cursory examination reveals gross exaggeration of compliance costs and employment impacts, and a lack of understanding of even introductory-level economics."
     The ad also does not note that Baldwin met with EPA's Lisa Jackson this spring to press for an extension to implementing this rule so that paper companies in Wisconsin and elsewhere can spread the associated costs of the rule over time, a move requested by the industry...
     AFF is organized as a 501(c)(4) nonprofit, which does not disclose its donors despite being largely dedicated to running television and web ads that promote right-wing causes and influence elections. The group is currently running pro-Romney ads in Wisconsin, and spent over $4 million in California in support of the anti-union Proposition 32.
     A large percentage of their 2010 funds came from a single source, the Center to Protect Patients' Rights (CPPR), another 501(c)(4) which made massive donations in support of various conservative groups for the midterm elections. The Center gave AFF $12 million, about half of their total budget for that year. CPPR is run by Sean Noble, who Politico described as an operative of the billionaire Koch brothers. Nobel was hired by the Kochs to coordinate with other conservative Super PACs to target Democratic representatives in 2010. One of Koch's subsidiaries, Georgia-Pacific, is a lead manufacturer of paper products in Wisconsin, including consumer tissue, towel and wiper products, corrugated packaging, and hardboard.