Three party leaders are starting the fourth day of the federal election campaign in Ontario. With 122 seats up for grabs, the province is pivotal in every party’s quest to form the next government. Conservative Leader Pierre Poilievre has been campaigning in the Greater Toronto Area the past few days and will begin his day in Hamilton, Ont., before travelling to Quebec. After his stops in Atlantic Canada, Liberal Leader Mark Carney will visit Windsor, Ont. NDP Leader Jagmeet Singh is spending his time in Hamilton and London, Ont. Follow along as CTVNews.ca and CTV News journalists on the campaign…