When Doug Emhoff made history as the first second gentleman, he knew another title — first Jewish spouse of a U.S. president or vice president — was just as significant. Emhoff has been at the epicenter of the White House response to the recent rise in antisemitism around the country. During a Hanukkah party at the vice president’s residence this week — where a Holocaust survivor and rabbis recited the blessing as Emhoff and Vice President Harris lit the candles on the Menorah — the second gentleman used the opportunity to remind those in attendance about the growing threat against...