Think Tanks + Advocacy

American Atheists
American Civil Liberties Union
American Enterprise Institute
Americans United For Separation of Church and State 
Bipartisan Policy Center
Cato Institute
Center For American Progress
Center on Budget and Policy Priorities
Citizens For Affordable Energy
Citizens for Tax Justice
Common Cause
Council on American-Islamic Relations
Council on Foreign Relations
Death Penalty Information Center
Drug Policy Alliance
Economic Policy Institute 
Foreign Policy Initiative
Free Press
Freedom From Religion Foundation
James Randi Educational Foundation
Ludwig von Mises Institute
National Academy of Sciences
No Labels
People For the American Way
Political Research Associates
Richard Dawkins Foundation
Southern Poverty Law Center
Tax Policy Center
Theocracy Watch