The election of 1904 went to the popular incumbent, Theodore Roosevelt. Roosevelt, who ascended to the presidency upon the assassination of William McKinley, used his first term to push progressive and government reforms.
Roosevelt easily won the election with 71% of the electoral votes. Notable in this election is the emergence of the Socialist party and its famous candidate, Eugene Debs. After Roosevelt was elected in 1904, he promised to serve only that term and then leave office. He did not run again in 1908, but did in 1912.