Brookings Institution  
   An independent research and policy institute with a left-liberal inclination, which seeks to improve the performance of American institutions, the effectiveness of government programs, and the quality of U.S. public policies.
   http://www.brook.edu/

Urban Institute  
   An institute investigating and analysing U.S. social and economic problems and issues, including the New Federalism, welfare and welfare-to-work, Medicare, and disabilities issues.
   http://www.urban.org/

Economic Policy Institute  
   A nonpartisan think tank that seeks to broaden the public debate about strategies to achieve a prosperous and fair economy.
   http://www.epinet.org/

Joint Center for Political and Economic Studies  
   A U.S. national, nonprofit institution that conducts research on public policy issues of special concern to African Americans.
   http://www.jointcenter.org/

Progressive Policy Institute  
   A public policy institute shaping the Third Way agenda with progressive legislative solutions.
   http://www.ppionline.org/

Worldwatch Institute  
   Analyzes interdisciplinary environmental data from around the world, providing information on how to build a sustainable society.
   http://www.worldwatch.org/

Institute for Policy Studies  
   An institute for progressive research and action to create a more responsible society built around the values of justice, nonviolence, sustainability, and decency.
   http://www.ips-dc.org/

Center for Defense Information  
   An institute monitoring the military. CDI provides independent analysis in the form of research papers, educational videos, and free e-mail and print newsletters.
   http://www.cdi.org/

National Democratic Institute for International Affairs  
   Non-profit institute associated with the U.S. Democratic Party, working to strengthen and expand democracy worldwide.
   http://www.ndi.org/

Center for National Policy  
   CNP undertakes research and analysis to frame options and to formulate policy recommendations, focusing activities in economic analysis, equal opportunity, community studies and foreign policy.
   http://www.cnponline.org/

Center on Budget and Policy Priorities  
   A public policy advocacy organization specializing in federal budget issues from a low-income perspective.
   http://www.cbpp.org/

Center for Law and Social Policy  
   CLASP is a non-profit organization with expertise in both law and policy affecting the poor. Through education, policy research and advocacy, CLASP seeks to improve the economic security of low-income families with children and secure access for low-incom
   http://www.clasp.org/

Century Foundation  
   A research foundation that undertakes timely and critical analyses of major economic, political, and social institutions and issues
   http://www.tcf.org/

Center for American Progress  
   A think tank offering policy proposals, talking points, events, news and columns. Weekly email newsletter Progress Report.
   http://www.centerforamericanprogress.org/