Does this explain why most liberals do not understand the U.S. Constitution?

You need to read the Constitution in order to understand it. Our Founding Fathers gave us a huge amount of writings about the debates that took place during the forming of the Constitution. They gave us the definitions of the wording that they but in the Constitution. But again, if you do not read it , you can not understand it. It is an easy read, one can read it in under an hour. Don't take others telling you what is in there, find out for yourself.