Where does any document or artificial entity get its authority for existing? Isn't it from people? The Constitution is a document, and may be an artificial entity, right? So, where do the people state their authorization for the Constitution? "We the people of the United States, in order to form a more perfect union, establish justice, insure domestic tranquility, provide for the common defense, 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." If the Constitution doesn't do the things that the Preamble says, it is of no effect. The Preamble is common law. It says that the Constitution is to be used as a benefit for people. For example. If you are taxed, and there is no clear benefit for you, and the Constitution does not stop your taxation, but rather seems to upholds it, the Preamble infers that such taxation is not part of the Constitution.