Levy's suit against Tendy was thrown out by Judge Lewis Lubell in State Supreme Court. Levy says he intends to appeal the ruling.
Levy alleges Tendy and his son filed dozens of signatures that appeared forged and fraudulently obtained.
"The evidence that Tendy and his adult son participated in the collection of over 200 fraudulently file signatures was clear, convincing, and uncontroverted," Marc Sabin, a spokesman for Levy, said in a statement. "Neither Tendy nor his son testified to offer an explanation for the illegally obtained signatures.
Tendy said they only had two expert witnesses testify to two signatures and that his son offered to testify, but Levy's lawyers didn't call him to the stand.
"Mr. Levy can say what he wants, but we got our signatures fairly," Tendy said. "We did everything above board. That's not what this campaign about."
Tendy said Levy is using sideshows to distract the voters.
"This campaign is about competence, professionalism, respect for police and running a professional ethical office," Tendy said. "He doesn't have any of those qualities."
Last week, Levy accused Tendy of interfering after Tendy's fiancée was arrested for a DWI. The charges were eventually dismissed.
Levy is the son of Judith Sheindlin, the host of the "Judge Judy" TV show.
Levy and Tendy face off in a Sept. 10 primary.
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