Cahill also made his first attempt to enter politics as a member of the Parliament of New South Wales, when he stood as the Labor candidate for the Legislative Assembly seat of Dulwich Hill at the March 1917 election. Bearing the marks of a young radical, Cahill campaigned on big ideas like the abolition of the Legislative Council and replacing the state Governor with the Lieutenant-Governor, but his comment that "the wealth of the country should be placed in one big pool" attracted amusement in the press. Cahill was subsequently defeated on a margin of 31-68% against the sitting Nationalist Party member, Tom Hoskins.