The 1920 United States presidential election in Arizona took place on November 2, 1920, as part of the 1920 United States presidential election in which all 48 states participated. Arizona voters chose three electors to represent them in the Electoral College via a popular vote pitting Democratic nominee James M. Cox and his running mate, Assistant Secretary of the Navy Franklin Roosevelt, against Republican challenger U.S. Senator Warren G. Harding and his running mate, Massachusetts Governor Calvin Coolidge.