In responding to a viewer question on methods to end legal tender laws, Ron Paul advocates state nullification to create a climate where Article I, Section 10 of the Constitution is followed by the states and competing currencies are introduced into the economy.

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http://www.ronpaulchannel.com/

Learn more about Nullifying the Fed:
http://tenthamendmentcenter.com/2012/07/25/end-the-fed-whether-congress-wants-us-to-or-not/