This is dirty politics, nearly as sleazy as it gets.

Days before voting Thursday in Gov. Andrew Cuomo’s primary race for re-election, the New York State Democratic Committee has sent voters a campaign mailer falsely accusing his challenger, Cynthia Nixon, of being “silent on the rise of anti-Semitism.”

It says she supports the Boycott, Divestment, Sanctions movement against Israel over its treatment of Palestinians. She does not. It accuses Ms. Nixon of opposing tax-supported funding of yeshivas, the private religious schools attended by many of New York City’s Orthodox Jews. She has never said that.

“With anti-Semitism and bigotry on the rise, we can’t take a chance,” the mailer reads. “Re-Elect Governor Andrew Cuomo.”

This is the lowest form of politics, and the most dangerous, exploiting the festering wounds and fears along ethnic and religious lines.