The past year may go down not only as the least productive ever in Washington but as one of the worst for the republic.

In both the executive branch and Congress, Americans witnessed an unwinding of the country's founding principles and of their government's most basic responsibilities. The rule of law gave way to the rule of rulers. And the rule of reality—in which politicians are entitled to their own opinions but not their own facts, as Sen. Daniel Patrick Moynihan liked to say—gave way to some politicians' belief that they...