He represented Beauce in the Legislative Assembly of Quebec from 1874 to 1878 as a Conservative.

[1] He was born in Saint-Georges de Beauce, Canada East, the son of Augustin Bonhomme dit Dulac and Marie Caron.

Dulac was mayor of Aubert-Gallion (later Saint-Georges) from 1870 to 1872 and warden for Beauce County in 1870.

He was first elected to the legislative assembly in an 1874 by-election held after Christian Pozer resigned after it became illegal to hold seats in both the House of Commons and the Quebec assembly.

Dulac also ran unsuccessfully as an independent candidate for a seat in the House of Commons in 1887.