He was a Corporate Town of Thebarton councillor from 1926 for many years, and was mayor from 1932 to 1937.
[9] He had previously unsuccessfully contested West Torrens at the 1933 election.
[10] Langdon was one of 14 of 39 independent lower house MPs at the 1938 election, which as a grouping won 40 percent of the primary vote, more than either of the major parties.
He was re-elected at the 1941 election, but died at a private hospital in Adelaide on 2 November 1942, after having collapsed in Parliament House after delivering a speech on 29 October.
[3] One of his sons, Arthur Louis Langdon, was elected to his Thebarton council seat upon his death.