The Cato Institute is a public policy research organization dedicated to the principles of individual liberty, limited government, free markets and peace.

Black Alliance for Educational Options is a national nonprofit group based in Washington, D.C. The alliance works to support parental choice and increase quality educational options for African-American students. Contact through Tanzi West, director of communications.

Alliance for School Choice is an organization in Phoenix that works to provide more educational opportunities for disadvantaged students. Contact through communications director Malcolm Glenn.

A public interest law firm based in Washington D.C. that litigates on cases where people’s civil rights are being restricted.

The National Marriage Project at the University of Virginia conducts research and analysis on marriage issues. Brad Wilcox is director.

Listen to a Jan. 16, 2006, story from National Public Radio’s Morning Edition about the Florida Supreme Court ruling that the voucher program violates the state constitution and the difficulties the voucher movement faces.

Voucher critics said the U.S. government report “Comparing Private Schools and Public Schools Using Hierarchical Linear Modeling,” released on July 14, 2006, shows that private schools are not significantly outperforming public schools, while U.S. Education Secretary Margaret Spellings discounted the study. The study examines math and reading scores of private and public school students.

On July 18, 2006, Republicans proposed a $100 million national school voucher program that would let low-income children in underperforming schools move to a different public school or a private school, including religious ones.

On May 7, 2013, The Supreme Court of Louisiana ruled that the state’s voucher system was unconstitutional. The court said that the money going towards the program and the private schools the vouchers are used towards should be used towards the public school system instead.