With one question, Rep. Elise Stefanik became the general of a war against antisemitism on college campuses across America: “Does calling for the genocide of Jews violate your university’s code of conduct?” The Ivy League presidents she questioned in December 2023 — just weeks after the atrocities of Oct. 7 led to an explosion of antisemitism at their schools — couldn’t answer it. The viral video of her query became the most-watched congressional hearing clip in history. Stefanik’s new book “Poisoned Ivies” explains how elite universities arrived at that moment — and why it was no flash-in-the-pan controversy, but an...