The primary opponent of Rep. Debbie Wasserman Schultz (D-Fla.), the former Democratic National Committee chairwoman, refused to congratulate her on her victory Tuesday night after a bitter campaign.

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Tim Canova, the law professor backed by Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.), said Tuesday night that he hadn't made the traditional concession phone call to Wasserman Schultz, who won 57 percent of the vote.

"I'll concede that Debbie Wasserman Schultz is a corporate stooge," Canova told reporters shortly before midnight, according to the Sun Sentinel.

"We're fighting for American democracy," said Canova, who got to 43 percent of the vote. "This is a rigged system and everyone knows it."

Canova spokesman Maurizio Passariello confirmed Wednesday afternoon that the candidate had not yet conceded, saying the campaign is investigating "apparent voting irregularities, including possible fraud."

Wasserman Schultz had 6,775 more votes than Canova with 100 percent of precincts reporting, according to the Associated Press.

Canova wasn't the only losing Florida primary candidate to express ill will toward his victorious opponent Tuesday night, instead of the traditional diplomatic congratulations.

Rep. Alan Grayson Alan Mark GraysonFlorida's Darren Soto fends off Dem challenge from Alan Grayson Live results: Arizona and Florida hold primaries The Hill's Morning Report: Frustration mounts as Republicans blow up tax message MORE (D-Fla.) declared he wouldn't endorse his Senate primary rival, fellow Rep. Patrick Murphy.

Murphy had been backed by the Democratic establishment over Grayson in one of the nastiest primaries of the cycle.

Grayson was bogged down by an ethics cloud surrounding his management of a hedge fund, as well as allegations of domestic violence.

"I'm not going to be endorsing Patrick Murphy for sure," Grayson told The Orlando Sentinel. "He's a Republican."

His new wife, Dena Grayson, ran to replace him in the 9th House District but she lost her primary Tuesday night as well.

And Carlos Beruff, the lone GOP Senate primary candidate to stay in the race against Sen. Marco Rubio Marco Antonio RubioMurky TikTok deal raises questions about China's role Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Florida senators pushing to keep Daylight Savings Time during pandemic MORE (R-Fla.), took a jab at the incumbent's original stated intention of not running for reelection.

"I made the miscalculation of taking Mr. Rubio at his word that he wouldn't seek re-election if he lost the Presidential Primary," Beruff said in a statement after losing to Rubio.

Updated 4:26 p.m.