Career
He represented Champlain in the House of Commons of Canada from 1917 to 1930 as a Liberal. He was born in Louiseville, Quebec, the son of Alexis Lesieur Desaulniers and Oliva Pichette. He was mayor of Sainte-Anne-de-la-Pérade from 1913 to 1919 and was warden for Champlain County in 1917.
Desaulniers was defeated by Jean-Louis Baribeau when he ran for reelection in 1930.
He died in Sainte-Anne-de-la-Pérade at the age of 81.