The vote by the Fraternal Order of Police Lodge 86 was overwhelming, said Vince Huber, president of the lodge.
Anderson, the Democrat who received the union's endorsement four years ago, lost the FOP's support to Republican challenger Steve Davis largely because he supported the consolidation of the Indianapolis Police Department and the Marion County Sheriff's Department, Huber said.
The merger was opposed by 97 percent of the union's members, and Anderson initially held the same position but changed his mind.
The FOP represents about 2,200 active members in 15 law enforcement departments; 111 voted on the endorsements Monday. Huber said the union's endorsements for state and federal offices would be announced today.
"If he flipped then, how is he going to flip in the future," Huber asked.
FOP members haven't forgotten that Anderson promised them he would not support consolidation efforts four years ago. The full list of endorsements by the FOP includes the following:
Sheriff -- Steve Davis; prosecutor -- Carl Brizzi; auditor -- Jennifer Ping; clerk -- Donna Edgar; recorder -- Angela Cypress; judges -- Robert Altice, Lisa F. Borges, Sheila A. Carlisle, Michael D. Keele, William J. Nelson, Carol J. Orbison, Scherry "S.K." Reid, Clark H. Rogers, Reuben B. Hill and William E. Young; Washington Township constable -- Pat Comiskey; Warren Township constable -- John Koss; Wayne Township constable -- Roger Bowser.