NEW YORK – Yahm Levin is a diehard Democrat who lives in one of the nation's most liberal cities. And yet the 39-year-old Jewish woman from Los Angeles is sometimes afraid to use her first or last name when meeting people — even those who share her progressive politics.Levin has learned from recent experience that being identified as a Jew, especially one who lived in Israel, can trigger uncomfortable questions from fellow Democrats. Or worse. So, she introduces herself by her middle name, Shelly, which she said feels safer.Recommended Videos“I don’t really feel comfortable in leftist circles anymore,” said Levin,...