ALEC (American Legislative Exchange Council): Partnership of America’s state legislators and members of the private sector. Writes model legislation to advance free-market enterprise, limited government, and federalism at the state level

American Crossroads: Conservative Super PAC (527) founded by Karl Rove and Ed Gillespie to raise funds from anonymous donors for the Republican Party

Americans for Prosperity: Conservative political advocacy group led by Tim Phillips and based in Arlington, Virginia. Seeks to advance every individual's right to economic freedom and opportunity

Americans for Tax Reform: Conservative political advocacy group led by Grover Norquist and based in Washington, DC. Opposes all tax increases and advocates for a national, single rate, flat income tax

Club for Growth: Conservative political advocacy group led by Chris Chocola and based in Washington, DC. Endorses candidates who support limited government, lower taxes and economic freedom

Crossroads GPS (Grassroots Policy Strategies): A 501(c)(4) nonprofit corporation, working in conjunction with American Crossroads, to promote the common good and general welfare of the people

FreedomWorks: Conservative political advocacy group led by Matt Kibbe and based in Washington, DC. Encourages young activists to fight for less government, lower taxes and more freedom

Heritage Action for America: Activists promoting conservative policies in Congress with blog, scorecard and watchlist. Based in Washington DC

National Federation of Independent Business (NFIB): Conservative political advocacy group based in Nashville, Tennessee. Includes their SAFE Trust (Save America's Free Enterprise Trust) PAC, Leadership Trust, and the Voter and Issue Education Campaigns Fund

National Taxpayers Union: Conservative political advocacy group led by Duane Parde and based in Alexandria, Virginia. Supports lower taxes, smaller government, accountability from public officials, and economic freedom at all levels by advocating reform of the tax code, less wasteful spending, and the adoption of constitutional provisions

Senate Conservatives Fund: Political action committee, founded by Jim DeMint in 2008, dedicated to electing conservatives to the U.S. Senate

Tea Party Nation: Conservative social network founded by Judson Phillips and based in Nashville, Tennessee

Tea Party Patriots: Conservative political advocacy group founded by Jenny Beth Martin and Mark Meckler and based in Woodstock, Georgia