Assemblyman John A. Pérez called Sunday for a recount in the razor-close primary election for state controller, a first step in what could become an expensive and lengthy effort to salvage his campaign for one of California’s top financial posts. Pérez, a Los Angeles Democrat, trails Betty Yee, a Democratic member of the Board of Equalization from the Bay Area, by just 481 votes — or one hundredth of one percent of the more than 4 million ballots cast. ”It is therefore of the utmost importance that an additional, carefully conducted review of the ballots be undertaken to ensure that every vote is counted, as intended,” Pérez said in a statement. The two controller candidates have been battling for second place in the primary in order to advance to the general election. Ashley Swearengin, the Republican mayor of Fresno, has already secured her spot on the November ballot by finishing in first place in the primary. Under California law, any registered voter can ask for a recount, but the person making the request has to foot the bill.