In the last few years, we have seen the executive branch declare itself outside the law - in prosecuting a war on terror. The law against torture has been suspended. The balance between the executive and legislative branch has been dismissed by signing statements and the theory of the unitary executive. The executive has declared its right to suspend habeas corpus indefinitely, to tap anyone's phones without court warrants and to detain and torture anyone it decides is an "enemy combatant." In that sense, we have already left the realm of constitutional government in favor of a protectorate outside the law promising to keep us safe (but never from itself).
But this new move to create a de facto dictator for the financial markets, to invest a Treasury secretary with unprecedented powers to buy and sell at close to a trillion dollar level - with no oversight or accountability: this is a new collapse in democratic life and constitutional norms.