The Constitution is a contract (between the sovereign states and the Federal government). The nature of the Constitution has been altered so much in the last hundred years that the Federal government has breached the contract. On that basis, each individual state (or portion thereof) should be able to declare the contract “null and void” and to establish [a] new contract or contracts.
The text of the Constitution indicates that it was a product of the "people" of the United States, not their state governments:
"We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America. "