Richard Kiley sings the big hit song from the musical, Man of La Mancha on The Ed Sullivan Show for February 20, 1966. The show opened off-Broadway on November 22, 1965 to, legend has it, great reviews but not the greatest business. After this appearance on Ed's show, the box office picked way up allowing the show to move to Broadway the following May. It ran there for a staggering 2,328 performances…