Hoover Institution  
   A think tank on the campus of Stanford University, dedicated to research in domestic policy and international affairs, committed to generating ideas that define a free society.
   http://www.hoover.org

Heritage Foundation  
   A conservative think tank that publishes research on domestic, economic, foreign and defense policy.
   http://www.heritage.org/

Heartland Institute  
   Chicago based think tank promoting public policy based on individual liberty, limited government, and free markets.
   http://www.heartland.org

Hudson Institute  
   A public policy research organization that forecasts trends and develops solutions for governments, businesses and the public. Addresses domestic and international policy issues.
   http://www.hudson.org/