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In his first election to Congress in 1942, Morrison defeated the conservative [[incumbent]], [[Jared Y. Sanders, Jr.]], in the Democratic primary. He was unopposed in the [[general election]] of 1942 as well as the elections of 1944 and 1946. He secured a total of twelve terms before Rarick, defeated him in the 1966 primary, 51.2 to 48.8 percent.

In his first election to Congress in 1942, Morrison defeated the conservative [[incumbent]], [[Jared Y. Sanders, Jr.]], in the Democratic primary. He was unopposed in the [[general election]] of 1942 as well as the elections of 1944 and 1946. He secured a total of twelve terms before Rarick, defeated him in the 1966 primary, 51.2 to 48.8 percent.

After the end of [[World War II]], Morrison introduced a bill to grant U.S. citizenship to New Orleans ''[[Mafia]]'' boss Sylvestro Carolla "Silver Dollar Sam" Carolla in order to prevent Carolla's deportation. He signed the [[Southern Manifesto]] and later joined all Louisiana congressional delegation members in voting against the [[Civil Rights Act of 1964]].

After the end of [[World War II]], Morrison introduced a bill to grant U.S. citizenship to New Orleans ''[[Mafia]]'' boss Sylvestro Carolla "Silver Dollar Sam" Carolla in order to prevent Carolla's deportation. He signed the [[Southern Manifesto]]<ref>[https://www.congress.gov/84/crecb/1956/03/12/GPO-CRECB-1956-pt4-3.pdf GPO-CRECB-1956-pt4-3.pdf]. ''Congressional Record''. Retrieved April 21, 2021.</ref> and later joined all Louisiana congressional delegation members in voting against the [[Civil Rights Act of 1964]].

Morrison was considered politically liberal during the 1960s because of his support for many federal social programs.

Morrison was considered politically liberal during the 1960s because of his support for many federal social programs.