NAFTA has already forced the abrogation of some US laws which did not conform with the treaty.
Everytime we enter into one of these complex treaties we give up some of our sovereignty.
Mexico and Canada are not democracies like us, they are police states run by bureaucracies, why give them control over our lives?
Smaller non-tariff agreements could have done the same thing as NAFTA without the loss of control.
Dubya's vision of an "ownership society" is actually a euphemism for a Banana Republic.