[citation needed] Delos R. Johnson was first elected to the Louisiana House of Representatives for Washington Parish unopposed in 1908.
Upon his re-election in 1924, Johnson served as the President of the Louisiana State Senate until the resignation of Lieutenant Governor Hewitt Bouanchaud on 12 April 1924.
Johnson was sworn in as the acting Lieutenant Governor of Louisiana that same day and held the position until his elected successor took office on 13 May 1924.
During both his service in the House of representatives as well as in the Senate, Johnson served as chairman of the education committee.
[1] Delos R. Johnson retired from politics upon his term's end in the State Senate in 1932, after which he continued practicing law.