iWatch: “A joint investigation by the Center for Public Integrity and the Center for Responsive Politics has found that more than 100 nonprofits organized under section 501(c)(4) of the U.S. tax code spent roughly $95 million on political expenditures in the 2010 election compared with $65 million by super PACs. Nearly 90 percent of the spending by these nonprofits — more than $84 million — came from groups that never publicly disclosed their funders, the joint analysis of Federal Election Commission data found. Another $8 million came from groups that only partially revealed their donors.”