"On Wednesday, the Canadian Television network reported that two unnamed Canadian sources said a "senior member" of Obama's campaign team had called Michael Wilson, Canada's ambassador in Washington, in the last month to warn him that Obama would be ratcheting up rhetoric against the North American Free Trade Agreement, but that he should "not be worried about what Obama says about NAFTA," adding, "It's just campaign rhetoric. … It's not serious."

http://www.abcnews.go.com/Politics/Vote2008/story?id=4365922&page=1