Kellogg–Briand Pact
In 1926, he defeated the Progressive Republican United States Senator Irvine Lenroot in the Republican primary. He won the general election with 55% of the vote against Democratic, Independent and Socialist Party candidates. Blaine served in the Senate from March 4, 1927 to March 3, 1933. He was the only senator to vote against ratification of the Kellogg–Briand Pact, which was approved 85–1. Blaine asserted that ratifying the treaty represented an endorsement of British imperialism. Blaine crossed party lines during the 1928 presidential campaign and endorsed Democratic nominee Al Smith for president. He later authored the 21st Amendment (Blaine Act), which repealed the 18th Amendment (Volstead Act), which had prohibited intoxicating liquors.