Jack Schlossberg, the grandson of John F. Kennedy who is running for Congress in New York, earlier this year posted an offensive comment on social media about procuring “Jew blood” and male semen for an energy recipe. Schlossberg, the 32-year-old Kennedy scion, has deleted the Jan. 20 post, in which he appeared to mock his mother’s cousin, Robert F. Kennedy Jr., and the so-called Make America Healthy Again (MAHA) movement. “I’ll have a MAHA energy ball,” wrote Schlossberg. He proposed a recipe that called for several ingredients, including “2 oz of Jew blood (ashkenazi not Sephardic).” “Baked at 300degrees until...