Two dirty Duceppian tricks.
1. The first: Saying that Option Canada wasn't a Liberal scandal, but a federal scandal... Whatever. Is anyone really going to buy that when the Conservatives supported the Bloc's call for the auditor general to look into the program? Adds Harper, "Ce n'est pas un crime de promouvoir le fédéralisme au Québec." Good response. (See, regardless of whether you like the Conservatives or not, having another federalist party besides the Liberals get a significant chunk of the vote in Quebec is a good thing for national unity.)
2. The second: Saying, "Il est clair que les partis dirigés de Toronto ou de Calgary ne peuvent pas répondre aux aspirations du Québec." Bah. As empty as anti-American rhetoric. Hopefully not as powerful.