Double negative

This is fascinating: a negative ad accusing the other guys of going negative, before they've gone negative. I didn't think that was possible, at least in this space-time continuum. GODEL INCOMPLETENESS THEOREM: The hitherto-unseen Liberal attack ads are not only the subject of the Tory attack ad, evidence of the ruling party's decadence ("when scandals continue to engulf your government ... what message can you possibly take to the people of Canada?"), but also retroactively justify it: "We only went negative because they were going to." Predicted Liberal response: Did Stephen Harper's friend George Bush teach him about pre-emptive war? Where are the WMD?