The third paragraph of Article VI of the Constitution of the United States includes this:
The Senators and Representatives before mentioned, and the Members of the several State Legislatures, and all executive and judicial Officers, both of the United States and of the several States, shall be bound by Oath or Affirmation, to support this Constitution;
I would guess that "support" does not forbid them to express disagreement with something in the Constitution or to propose that something in it be amended.
I would also guess that it does mean they acknowledge that whatever power and authority they have is subordinate to the federal Constitution.
Doubtless someone somewhere has more than just guesses about this.