American Enterprise Institute for Public Policy Research (AEI) Atlas Foundation Bill of Rights Institute Buckeye Institute Cascade Policy Institute Cato Institute Citizens Against Higher Taxes Commonwealth Foundation Competitive Enterprise Institute Empire Center for New York State Policy Evergreen Freedom Foundation Georgia Public Policy Foundation Heritage Foundation Independent Institute John Locke Foundation Lincoln Institute Mackinac Center for Public Policy Manhattan Institute Mars R&R Services Nevada Policy Research Institute Oklahoma Council of Public Affairs Pacific Research Institute Pennsylvania Family Institute Pennsylvanians for Right to Work Pennsylvania Leadership Council Pennsylvania Manufacturers' Association PERC-The Center for Free Market Environmentalism Reason Foundation Shenango Institute Susquehanna Valley Center TechCentralStation Texas Public Policy Foundation The Heartland Institute The James Madison Institute for Public Policy Studies The South Carolina Policy Council