The 1920 United States presidential election in California took place on November 2, 1920, as part of the 1920 General Election in which all 48 states participated. California voters chose 9 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, Governor Calvin Coolidge. Warren Harding carried California in a landslide, winning with 66.20% of the vote to James Cox's 24.28%.