Historically, our system of checks and balances has worked pretty well—but not, or not entirely, because of the constitutional system designed by the founders. Democracies work best—and survive longer—where constitutions are reinforced by unwritten democratic norms. Two basic norms have preserved America’s checks and balances in ways we have come to take for granted: mutual toleration, or the understanding that competing parties accept one another as legitimate rivals, and forbearance, or the idea that politicians should exercise restraint in deploying their institutional prerogatives. These
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