He was a member of the New York State Assembly (New York Co., 24th D.) in 1907. He was the first county clerk of Bronx County 1914–1918. Ganly was elected as a Democrat to the Sixty-sixth Congress, defeating Benjamin L. Fairchild and serving from (March 4, 1919 - March 3, 1921). He was an unsuccessful candidate for reelection in 1920 to the Sixty-seventh Congress, losing to Fairchild.[1][2]
Last years and death
Ganly was elected to the Sixty-eighth Congress and served from March 4, 1923, until his death in an automobile accident in New York City on September 7, 1923, before the convening of Congress. He was interred in St. Raymond's Cemetery, The Bronx, New York. He was again succeeded in Congress by Fairchild.[1]