Tim's assistance was given in my first thread regarding this topic.
Melbourne Corp principle runs a bit deeper than that. It's not about restricting the Commonwealth from tyearannical governance, it's more about upholding the parallel structure of plenary State powers and restricting federal powers to within the heads of power. If it were intended just to restrict tyearanny, the States wouldn't have plenary powers, either.
Amending the Constitution is also not that easy - it requires a referendum, and there have only been eight successful referendums out of 44 since the Constitution was enacted.
Anyway. Onward to exams.
