SS+AP+Gov

Budget of the United States Government
Pew Research Center is a nonpartisan fact tank that informs the public about the issues, attitudes and trends shaping America and the world. It conducts public opinion polling, demographic research, media content analysis and other empirical social science research.

Pogo is "an independent nonprofit that investigates and exposes corruption and other misconduct" in the federal government. Includes information on investigations, reports, and publications. http://www.pogo.org/