Cuomo is widely expected to win the Democratic gubernatorial primary, having received endorsements from The New York Times and the New York Daily News.
Nixon was joined by Councilman Jumaane Williams, who is running for lieutenant governor, in Queens.
Nixon's alleged support of the BDS movement was one of three bullet points used in a pro-Cuomo mailer that was sent out less than a week before Thursday's Democratic primary.
While a Nixon victory appears very unlikely, last-minute controversies surrounding the opening of the Gov. Mario M. Cuomo Bridge and a mailer to Jewish voters suggesting Nixon is anti-Semitic could haunt Cuomo and show that he is not without his own vulnerabilities.
State attorney general candidate Tish James was also at the pep rally, which was attended by dozens of local and state lawmakers.
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In the video, Schiff said that people in NY are "tired of the cynical, self-serving corporate Democrats" and that they want to see "courageous, honest Democrats".
In an interview on Tuesday with the Time On Politics reporter Lisa Lerer, Nixon said of the mailer: "I thought it was disgusting and cynical and really surprising that Andrew Cuomo's New York State party would stoop to this kind of fear-mongering and lies". She would also be called to account for her idiosyncratic taste in bagels, and her support for a British tea shop frequented by her former co-star Sarah Jessica Parker.
Cynthia Nixon is running on a platform that includes raising taxes on the rich, increasing school spending, ending cash bail and legalizing marijuana - hoping to harness the same left-wing energy that already has delivered upset wins to high-profile liberal candidates in other primaries this year.
Cuomo denied advance knowledge of the mailer.
Political observers say that turnout is an overriding factor, but if damaging stories continue to come out about Cuomo, whether concerning the bridge, the mailer or other issues, "it's likely to affect at the margins the spread", said Levenson. Leecia Eve, a former Cuomo aide, was in fourth. She later paired up with attorney general hopeful Zephyr Teachout in Manhattan.
The victor of the Democratic primary will face Republican Keith Wofford in the attorney general's race in the heavily blue state. Dealing with state corruption was the only issue that likely Democratic primary voters saw Nixon doing a better job on than Cuomo in the September 10 Siena poll, 42-39 percent.