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Cabot was born in Hobe Sound, Florida, in 1917. Cabot was a clerk in the Broward County Circuit Court from 1945 to 1953. He graduated from the University of Miami School of Law with an LL.B. in 1953. Cabot was in private practice in Fort Lauderdale from 1953 to 1959. He was a member of the Florida State Senate from 1954 to 1958. From 1959 to 1966, he was a Broward County Circuit Court judge.
President Lyndon B. Johnson nominated Cabot to the United States District Court for the Southern District of Florida on July 11, 1966, to the new seat created by 80 Stat. 75. Confirmed by the Senate on August 10, 1966, he received commission on August 11, 1966. Cabot served on the court until his death in 1971.