The 2016 election campaign is mortifying millions of Americans in part because the presidency has become far more dangerous in recent times. Since Sept. 11, 2001, we have lived in a perpetual emergency, which supposedly justifies routinely ignoring the law and Constitution. And both Donald Trump and Hillary Clinton have signaled that power grabs will proliferate in the next four years. Politicians talk as if voting magically protects the rights of everyone within a 50-mile radius of the...
