Moore entered the Legislative Assembly of Queensland in 1915 representing the Farmers Union (a forerunner to the Country Party) in the seat of Aubigny. This election saw the defeat of the government of Digby Denham and the election of the Labor government of Thomas J. Ryan. The non-Labor forces in Queensland were in a period of chronic disunity, with the Country Party coming into conflict with what was then known as the Queensland Liberal Party but would later also be called the National and then the United Party. Bitter strife within and between these various parties was a contributing factor to Labor's election victories in 1920, and 1923.