Isn't it interesting when the candidates have to choose between a policy that will get them elected and a policy that might please Canadians?
Face it..there IS no safe stance on an issues like NAFTA. No matter what you try, you will upset someone. Woodrow Wilson tried protectionism and isolationism just before WWI, but when his hand was forced, he tried to please everyone by helping win the war, then suggested the League of Nations...which was less successful than NAFTA.
Ok, so that's not the best example, but maybe it makes my point. No program like NAFTA can possibly be all things to all people.

And Obama seems to realize that and try NOT to make promises he can't keep and take positions he won't be able to defend later.