Thirty tablets and a laptop computer were stolen over the weekend from the Orange County campaign office of Republican Assemblywoman Young Kim, a spokesman said.
Kim's campaign staff arrived Sunday morning to find that someone had broken through a door on the fourth floor of an office building in Buena Park, campaign spokesman Dave Gilliard said.
The building is new and largely unoccupied, and the electronic equipment was not visible from outside, he said.
"Somebody had to know that that office was up there and had to specifically target it," Gilliard said Monday. "It wasn't somebody walking down the street."
The equipment was worth about $10,000, and a report was filed with the Buena Park Police Department, he said.
Kim, a first-term lawmaker, faces Democratic former Assemblywoman Sharon Quirk-Silva in one of California's most competitive legislative races. The contest is one of a handful that will determine whether Democrats have an Assembly supermajority next year.
The tablets were used for neighborhood canvassing and contained private information about voters, though thieves would need a password to access it, Gilliard said.
Kim used the theft in a fundraising pitch, asking supporters to donate to help her "fight these dirty tricks."