I agree with Dukie here. The Supreme Court (and other courts) have been filled with people who believe in a "living Constitution" and no longer rule on whether new laws are "Constitutionaly legal" or not so these rulings from the '70s and '80s were made by the same people that taught Bill and Hillary how to be socialists.
Read the Federalist Papers, even the supporter of a central bank (Hamilton) argued for metals to be the currency of the United States. If you look at history, there is no denying that metal coins were to be the currency of the US.
By the way, the Supreme Court supported the taking of gold from American citizens in 1993, abortion, the Social Security system, and gun control; do you support those perversions also, poohbah?
Do you understand the principle of stare decisis? These rulings are from lower courts and were routinely denied cert, which means that they were in conformance with pre-existing precedent...which dates back to the Legal Tender cases (Knox vs. Lee and Parker vs. Davis) of 1871.