The doctrine of judicial review, which is nowhere to be found in the Constitution, has done nothing to defend liberty against excesses by government. This unconstitutional power was usurped by the Supreme Court, says Ron Paul. It is federalism and states’ rights that should protect our liberty, not a godlike Supreme Court.
The commerce clause was to give Congress the power to regulate foreign trade, and to prevent states from imposing tariffs on interstate goods. In Federalist Paper No. 22, Alexander Hamilton makes it clear the intent behind the clause was to prevent states from placing tolls or tariffs on goods as they passed through each state-- a practice that had proven very destructive across the principalities of the German empire.