The Labour candidate in the Holborn and St Pancras by-election says the Green Party's motion declaring Zionism a form of racism has concerned voters in the crunch poll.
Sagal Abdi-Wali, who is going head-to-head with Green Party leader Zack Polanski in the north London vote on Thursday, said the proposal was "worrying for anyone who believes in a two-state solution".
Motion 'divisive' at school gates
Ms Abdi-Wali told the Standard: "It has been brought up to me by people literally at the school gates this morning, of how like divisive they found that motion and how worried they are by it.
"I think it's worrying for anyone who believes in a two-state solution.
"The message from residents has been quite insightful in their response to, to what's happened there."
Israel's foreign ministry banned Mr Polanski, who is Jewish, from entering the country after the motion was passed by his party's members on Sunday. He did not take part in the vote at the party's conference in Brighton because he was campaigning in Holborn and St Pancras, where he is hoping to overturn a large Labour majority in the seat vacated by former prime minister Sir Keir Starmer.
Conference division
The Green Party ended its annual conference divided after the controversial motion, which was backed by 1,022 votes to 813. Members endorsed the policy, which defines Zionism as an ideology supporting "an ethnonationalist Jewish state" and backs a "single democratic Palestinian state".
Four of the five elected Green MPs - Sian Berry, Carla Denyer, Adrian Ramsay and Ellie Chowns - publicly said they did not support the Greens4Palestines' proposal. The fifth, Hannah Spencer, did not state her view. In an Instagram post following the vote she said: "I'm proud to be part of a party committed to Jewish rights, and Palestinian rights."
Mr Polanski did not take part in the vote, which also divided his deputies. Deputy leader Rachel Millward called the motion "problematic", suggesting she would not vote for it. But her co-deputy, Mothin Ali, said he did support the move and would vote in favour of it.
MPs' joint statement and condemnation
In a joint statement following the vote, the five elected Green MPs said: "As Green Party leaders and MPs, we will always uphold universal human rights.
"We will never tolerate any form of discrimination or harassment. We will continue to stand in opposition to genocide, ethnic cleansing, apartheid and the illegal occupation.
"We will continue to call out the heinous crimes of the Netanyahu government.
"And we will continue to work to ensure that the Green Party is an anti-racist party in every way.
"We know there is no conflict between supporting the rights of Palestinians and the rights of Jewish people."
Jewish groups condemned the motion. "Zionism is anti-racism, creating a refuge for Jews in their ancient homeland after millennia of persecution outside it," the Board of Deputies of British Jews and the Jewish Leadership Council said. "Branding most British Jews and Jewish institutions 'racist' stokes anti-Jewish hatred after a year in which British Jews have been murdered attending their synagogue, stabbed in the streets, and seen their community buildings firebombed."
Israel accused the Green Party of legitimising "the destruction of the State of Israel" with a "clear antisemitic text". In a statement on Sunday evening, Israel's Ministry of Foreign Affairs said the Greens' resolution "constitutes a clear antisemitic text according to the IHRA definition, as it denies the Jewish people's right to self-determination". "Therefore, as a first step, foreign minister Gideon Sa'ar has decided this evening to declare Green Party leader Zack Polanski barred from entering Israel."
