In January, Vice-President J. D. Vance delivered a Jewish prayer during a wedding at a synagogue in Rockville, Maryland. The bride was Rachel Altman, the director of outreach at a tech think tank. The groom was Vance’s 35-year-old chief of staff, Jacob Reses. They all stood under a chuppah interwoven with white roses, carnations, and wisteria as Vance wished the couple happiness and health. Men sat on one side of the room, women on the other, while Secret Service agents watched over the premises. Video shot after the ceremony shows a beaming Reses, balding and bespectacled, being hoisted onto a...