Claim: The 1934 United States Senate election in New Jersey was the first of a streak in which incumbents lost, with incumbent Republican Hamilton Fish Kean losing to Democrat A. Harry Moore.
Evidence: Republican A. Harry Moore 
Arthur Harry Moore (July 3, 1877 – November 18, 1952) was a Democrat who was the 39th Governor of New Jersey, serving three terms between 1926 and 1941. 1935 to 1938, United States Senator Arthur Harry Moore Hamilton Fish Kean