ORONTO (Reuters) - Voters in Ontario, Canada's richest province, turned their backs on Thursday on eight years of Conservative Party rule, handing an overwhelming majority to the Liberal government that promises to roll back tax cuts given by the Conservatives. The Liberals, led by Dalton McGuinty, captured 71 seats in Ontario's 103-seat Legislature, compared with 25 seats for the Conservative Party of Premier Ernie Eves. The left-leaning New Democratic Party won seven seats across the province.The Liberal Party's landslide win marked a stark reversal from the 1999 election, when it won 35 seats compared with the Conservative Party's 59-seat win.The...