From Credit Union Times:

In addition to the R Street Institute and Competitive Enterprise Institute, free-market think tanks that support credit union member business lending legislation, the letter was signed by representatives of the Blue Ridge Forum, American Commitment, the Republican National Policy Committee,  the 60 Plus Association, Tea Party WDC, Less Government, the Center for Freedom & Prosperity, National Center for Public Policy Research, National Taxpayers Union National Tax Limitation Committee, American Enterprise Institute and Human Events.

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