Democratic-leaning group originally formed in 2005 to oppose President George W. Bush’s Social Security proposal.
Founded by a former Republican senator and a former GOP House aide. Leans GOP/Right-center.
Labor union representing 1.6 million employees including health care workers, corrections officers and sanitation workers. Leans Democratic.
Advocates for less government spending. Leans Republican/conservative.
Conservative-leaning group founded with help from Karl Rove and former RNC Chairman Ed Gillespie.