From the Center When an upstart political rebel rages against the establishment—whether Donald Trump from the right or Bernie Sanders from the left—they are channeling the growing unhappiness and dissatisfaction that frustrated voters feel toward the political system. Think of this phenomenon as middle-finger politics. And it should be no surprise that the residents of our nation’s largest city have found a new way to demonstrate their anger. There is no guarantee that Zohran Mamdani will...