CRP: ‘Several nonprofit organizations that don’t disclose their donors but have been deeply involved in partisan politics during the last several years have received multimillion-dollar contributions from groups that are familiar players in Republican circles. The GOP nonprofits — American Action Network, which spent $26 million on ads in the 2010 mid-term elections; Crossroads GPS, which spent $16 million; and the American Future Fund, which laid out $9.6 million — are all organized under section 501(c)(4) of the Internal Revenue Code. They and the individuals who run them have strong ties to some of the same political networks, research by OpenSecrets Blog shows.”