More corporate money is routed secretly through non-profits like Chamber of Commerce than super PACS
...", corporate contributions to super PACs are just the tip of the iceberg. Substantially more corporate money is routed through non-profit “social welfare” groups and trade associations like the U.S. Chamber of Commerce, which spend millions of dollars on electioneering but don’t reveal their donors. As the New York Times recently reported, secretive tax-exempt groups outspent super PACs by a 3-to-2 margin in 2010, and “such groups have accounted for two-thirds of the political advertising bought by the biggest outside spenders so far in the 2012 election cycle.”17ENDNOTE 17 17 Mike McIntire & Nicholas Confessore, Tax-Exempt Groups Shield Political Gifts of Businesses, N.Y. TIMES, July 8, 2012, atA1.David Earley and Ian Vandewalkerm, "Transparency for Corporate Political Spending: A Federal Solution," Brennan Center for Justice, http://brennan.3cdn.net/27f3a9e8709aabbc4d_kom6iyjfw.pdf