High Quality Content by WIKIPEDIA articles! By-elections were held on February 8, 2007, in Ontario, Canada, to fill three vacancies in the Legislative Assembly of Ontario. By-elections were held in three electoral districts (ridings): Burlington, Markham and York South–Weston. The by-elections resulted in York South-Weston being taken by the NDP from the Liberals, Burlington remaining Progressive Conservative and Markham being retained by the Liberals.