The newspaper's managing editor, Kevin Whitmer, confirmed in an e-mail message that columnist Tom Moran will no longer be a panelist in the debate at William Paterson University in Wayne.
Election Law Enforcement Commission rules restrict media outlets involved in the debate from endorsing candidates before the Oct. 16 event.
The Ledger endorsed independent Chris Daggett on Sunday, becoming the first major newspaper to make an endorsement in the race.
The other debate co-sponsors are unaffected.
The second gubernatorial debate includes Daggett, Democratic Gov. Jon Corzine and GOP challenger Chris Christie.
By: The Star-Ledger of Newark has withdrawn as a participant in Friday's gubernatorial debate after endorsing a candidate before the event.