Since the year 2009, Mr. Evers has held sway in the councils of Wisconsin—first as Superintendent, now as Governor. For over a decade and a half, the arc of public policy has bent beneath his steady, singular influence.

It is the lesson of both ancient republics and our own sacred experiment: Power, long held, tends to corrupt the judgment, even of the virtuous. Though Governor Evers has served with civility, no one man should dwell too long in the executive chair.