Less than a third of NYC Jewish voters think socialist Mayor Zohran Mamdani is doing a good job — and most link the Big Apple’s rising antisemitism to Hizzoner and his comrades mainstreaming anti-Zionism , a new poll shows. Forty percent of Jews who voted in last year’s mayoral race think Mamdani is doing a “poor” job, 32% rate his performance “excellent” or “good,” 18% say he’s doing a “fair” job, and the rest are undecided, according to The Jewish Majority poll exclusively provided to The Post. The advocacy group’s poll also shows a whopping 82% of Jewish voters – including two-thirds who voted for Mamdani – are “very” or “somewhat” concerned about the rise in antisemitism. And of those concerned, 73% attribute the spike to Mamdani and other public figures “normalizing” anti-Zionism, so it’s more widely accepted publicly.…