Secret donors propel nonprofit political spending

Nonprofit "social welfare" organizations outspent the more highly publicized super PACs in 2010 on elections. Both can accept unlimited contributions from corporations, unions and wealthy individuals, but nonprofits do not have to report their donors.

2010 nonprofit spending: 94.8 million from social welfare and $65.3 million from super PACs
Source: Analysis of Federal Election Commission data by the Center for Public Integrity and the Center for Responsive Politics.
Graphic by Ajani Winston/iWatch News