The editor of the New Yorker magazine publicly urged President Joe Biden to quit his reelection campaign, saying his dreadful debate performance against former President Donald Trump was “agonizing” to watch. David Remnick joined the editorial boards of the New York Times and the Atlanta Journal-Constitution in saying Biden should step aside to avoid losing to Trump in November. In a “Daily Comment” essay posted at the top of the New Yorker website Saturday, said that “watching Thursday’s debate, observing Biden wander into senselessness onstage, was an agonizing experience.” “You watched it, …