U.S. Sen. Joseph I. Lieberman has pushed for school vouchers in various forms for years.
In the latest version, he is joining with the top Republican in Congress - House Speaker John Boehner - to push for vouchers for children in the Washington, D.C. public schools.
Vouchers have been highly controversial for years as supporters say they help children who are trying to learn in poorly performing public schools and detractors say that they drain some of the best students away from the public schools.