The resolution makes a dangerous conflation—and quite a few Democrats gave their wholehearted support.
“The resolution suggests that all anti-Zionism—it states—is antisemitism. That’s either intellectually disingenuous or just factually wrong,” said New York Representative Jerry Nadler, who voted present. “The authors if they were at all familiar with Jewish history & culture should know about Jewish anti-Zionism that was and is expressly not antisemitic. This resolution ignores the fact that even today, certain Orthodox Hasidic Jewish communities … have held views that are at odds with the modern Zionist conception.”
They are putting on a show of being opposed while not doing everything in their power to oppose it. It's similar energy to when Justin Trudeau joined a BLM protest instead of using his position as prime minister of Canada to take a real stand against police brutality.