Later that year he became leader of the Liberal Party of Ontario. His support of farmers and free trade, and his former membership in the UFO allowed him to attract Harry Nixon's rump of UFO Members of the Legislative Assembly (MLAs) into the Liberal Party (as Liberal-Progressives). This and the Great Depression led to the defeat of the unpopular Conservative premier George Stewart Henry in the 1934 provincial election. His stance against the prohibition of alcohol allowed him to break the Liberal Party from the militant prohibitionist stance that had helped reduce it to a rural, Protestant south western Ontario rump in the 1920s.