It was also the first Canadian election to use much negative advertising; one anti-free-trade advertisement showed negotiators "removing a line" from the Free Trade Agreement, which at the end of the advertisement was revealed to be the Canada–US border. Although some opinion polls showed slightly more Canadians against the Agreement than in favour of it, Mulroney's Progressive Conservatives benefited from being the only party in favour of the agreement, while the Liberals and NDP split the anti-free trade vote. In addition, future Quebec Premiers Jacques Parizeau and Bernard Landry backed the agreement which was seen as a factor for the PC party support in Quebec. Mulroney won a governing majority and the agreement was passed into law even if a majority of the voters had voted for parties opposing free trade.