A former sergeant with the Cobb County Sheriff’s Office has announced his intention to challenge Sheriff Neil Warren over leadership of the agency in the 2020 election.

Jimmy Herndon, a Democrat, launched his website and fundraising campaign over the weekend. His platform, as described on his website, emphasizes financial accountability, transparency, employee morale and community trust.

While 2020 qualifying isn’t until next year, Cobb is expected to be highly competitive in many races and candidates have already begun fundraising and campaigning.

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State Election Board Vice Chair Janice Johnston speaks during an election board meeting at the Capitol in Atlanta on Wednesday, Dec. 10, 2025. (Arvin Temkar / AJC)

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools