High Quality Content by WIKIPEDIA articles! The Canadian federal election of 1957 was held June 10, 1957, to select the 265 members of the House of Commons of Canada. In one of the great upsets in Canadian political history, the Progressive Conservative Party (also known as "PCs" or "Tories"), led by John Diefenbaker, brought an end to 22 years of Liberal rule, as the Tories were able to form a minority government.