He resigned from the Senate in 1906 to run in the riding of Victoria City when the current MP, George Riley (who was soon after appointed to the Senate), resigned to allow him to run. He was elected in the resulting by-election but was defeated in the 1908 federal election. In 1909, the current MP for the riding of Comox—Atlin, William Sloan, resigned to allow Templeman to be acclaimed as the MP in the resulting by-election. He was defeated again in the 1911 federal election in the riding of Victoria City. From 1906 to 1911, he was the Minister of Inland Revenue. From 1907 to 1911, he was the Minister of Mines.
References
^"Canada Census, 1881," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MVXF-MHY : 2 March 2021), Wm. Templeman, Almonte, Mississippi Mills, Lanark, Ontario, Canada; from "1881 Canadian Census." Database with images. Ancestry. (www.ancestry.com : 2008); citing Wm. Templeman, citing Library and Archives Canada, Ottawa, Ontario.