Herndon declared his candidacy in August.
According to Herndon’s lawsuit, the sheriff and his employees have continued to block critics, including himself, and delete critical posts.
Glenn Daniel, a spokesman for the Sheriff’s Office who is also named in the complaint, said the department had not been served and was unable to comment.
Herndon is seeking the immediate restoration of his access to the Cobb Sheriff’s Facebook page through a preliminary injunction. The lawsuit is asking a judge to instruct the sheriff to discontinue the practice of blocking critics, as well as for damages.
Separately, Warren is facing a racial discrimination suit filed by an employee and his campaign finances are under investigation by the state ethic's commission.