OTTAWA (Reuters) - Canada's opposition Liberals could suffer their worst electoral showing in nearly a quarter century, the Ekos polling company projected on Monday. Based on surveys over the past three days, Ekos said the ruling Conservatives were slipping away from their chance to form a majority government, but could still take twice as many seats as the Liberals. ... Ekos projected the Conservatives would win 147 of the 308 seats in the House of Commons, shy of the 155 needed for a majority but above the 127 they have now. The Liberals would drop to 71 seats from 95....