But the biggest “Jew” today in the demonology of modern anti-Semitism is the Jewish state, Israel. While there are perfectly legitimate criticisms that one can make of Israel or the actions of its government — and I have never been shy about making them — those criticisms cross the line into anti-Semitism when they ascribe evil, almost supernatural powers to Israel in a manner that replicates classic anti-Semitic slanders.

During the weeklong November 2012 war, which began when Hamas fired roughly 100 rockets at civilian targets, Israel “hypnotized” nobody. It was subject to the usual barrage of intense criticism in the news media and at the United Nations, and from the leaders of other nations, not to mention protesters across the world. That Israel continues to retain support in the United States among mainstream Democrats and Republicans is because — contrary to Ms. Omar’s tweet — the Jewish state is not engaged in “evil doings,” but defending itself against the enemies pressing on all of its borders, including Hamas, which has genocide of the Jews, and a belief in Jewish manipulative power, at the heart of its ideology. The original Hamas charter from 1988, only recently revised, claimed that the Jews orchestrated the French and Russian revolutions and both world wars.

Those who call themselves anti-Zionists usually insist they are not anti-Semites. But I struggle to see what else to call an ideology that seeks to eradicate only one state in the world — the one that happens to be the Jewish one — while empathetically insisting on the rights of self-determination for every other minority. Israeli Jews, descended in equal parts from people displaced from Europe and the Islamic world, are barely 6.5 million of the world’s 7.7 billion people. What is it about them, exactly, that puts them beyond the pale?

During that interview with CNN, Ms. Omar also tried to defend another of her controversial tweets, this one from last Tuesday, suggesting that Senator Lindsey Graham, the South Carolina Republican, was being blackmailed. Many people read this as an insinuation that he is gay and closeted, and someone was threatening to out him. Her evidence? She had none. But it was in keeping with her predilection for making accusations based on nothing more than prejudiced stereotypes.

Democrats may want to believe that such conspiracy thinking is the domain of the Republican Party. But Ms. Omar’s comments are proof that no party has a monopoly on speciousness.

The particular challenge in the case of Ms. Omar is that she is exactly the kind of politician a vast majority of American Jews, who overwhelmingly vote Democratic and who have long aligned themselves with liberal causes, want to celebrate: Here is a refugee, a mother, a Muslim and a woman of color — the first woman of color to represent Minnesota in Congress. It’s no wonder she has already landed on the cover of Time magazine and in front of Annie Leibovitz’s camera. Who wouldn’t want to cheer her on?

Indeed, some Jews have insisted that we ought to hold back from criticizing people of color who have recently exposed their anti-Semitism (Tamika Mallory, Marc Lamont Hill) because, well, it’s just not a good look to be criticizing leaders of the black community right now.