Cerezo served as a member of the
Puerto Rico House of Representatives between 1969 and 1973. Elected in 1968 under the newly founded
New Progressive Party at an early age, incoming Speaker
Angel Viera Martínez appointed him to chair one of the House's two most powerful committees, the Government Affairs Committee. Cerezo came out against the
Vietnam War and ended up losing his chairmanship, ending his elective career. From 1989 to 1991, Cerezo once again collaborated briefly with the pro-statehood
New Progressive Party(NPP) when he accepted party president
Carlos Romero Barceló's invitation to spearhead the party's lobbying efforts to get Congress to approve a bill providing for a referendum in Puerto Rico on political status options. Cerezo put together a group of ad hoc volunteer lobbyists, including Romero, legendary party founder
Luis A. Ferré, in his late 80's at the time, as well as a younger cadre that included attorney
Carlos Díaz Olivo, now a law professor, businessman
Cesar Cabrera, subsequently a United States Ambassador, attorney
Luis Fortuño, subsequently Governor of Puerto Rico, and
Kenneth McClintock, who later became the territory's
President of the Senate and
Secretary of State. When
Pedro Rosselló became party president and Cerezo questioned many of Rossello's policies, Cerezo once again withdrew from collaborating with the NPP. After leaving the NPP sphera, he went on to have a successful law practice and a career as a non-affiliated political analyst. ==Political analysis==