The advertisement, paid for by an anonymous organization called BDS Report, was released as the CUNY student government prepared to consider dueling resolutions addressing antisemitism at a meeting last weekend. It was only the most striking of what students on both sides said was a flurry of outside advocacy that poisoned an already deeply divisive debate. Both of the resolutions, the latest in a spate of similar initiatives at campuses across the country, dealt with the very definition of antisemitism — a seemingly esoteric issue that has increasingly become a proxy for larger questions concerning the polarizing politics of the Israeli-Palestinian conflict, identity and free speech. And, after the intervention of national pro-Israel groups, both resolutions failed to pass at a contentious, hours-long Zoom meeting of CUNY’s Student Senate on Sunday.