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Members have also included Ontario Conservative Premiers Sir James Whitney, Sir William Hearst, Howard Ferguson, George Henry, Thomas Kennedy, George A. Drew, Leslie Frost, John Robarts, William Davis, Frank Miller and Mike Harris.
Grummett was defeated in the 1955 general election by Ontario Progressive Conservative Party candidate Wilf Spooner, who was mayor of Timmins, Ontario, when the Liberals failed to field a candidate allowing "old party votes" to coalesce around Spooner.
The Congress expressed support for Ontario Progressive Conservative Party leader John Tory's proposal during the 2007 Ontario provincial election campaign to publicly fund faith-based schools arguing that rejecting the proposal would signify a retreat from multiculturalism.
In the 1987 provincial election, Chong was a Progressive Conservative candidate in York Mills, losing by 3000 votes to Liberal Brad Nixon.
Mark Bonokoski is the communications director to Ontario Progressive Conservative Party leader Tim Hudak.
With the defeat of the Macdonald government in the provincial election that December, Cameron became leader of the Ontario Conservative Party, but stepped down in 1878 to became Chief Justice of the Court of Common Pleas.
In the 1995 provincial election, Ontario Progressive Conservative Party leader Mike Harris campaigned on reducing the level of government in Ontario, and promised to examine Metropolitan Toronto with an eye to eliminating it.
Earlier that year, the MCC came out against a proposal by John Tory and the Ontario Progressive Conservative Party to publicly fund faith-based schools accusing the Tories of "pandering to clerics".