Mr. Mendoza ran pledging to "fight for California consumers, not special interests," and cited his actions as corporations commissioner in "strengthening patients rights dealing with HMOs."

In the Democratic primary election, with 99.8 percent of the vote counted, the totals were: John Garamendi, 38.5 percent; Tom Umberg, 28.1 percent; Tom Calderon, 23.1 percent; and Bill Winslow, 10.3 percent.

In the Republican primary election, with 99.8 percent of the vote counted, the totals were: Gary Mendoza, 41.7 percent; Stefan Watchdog Stitch, 36.4 percent; and insurance agent Wes Bannister, 21.9 percent.

Amongst the Democrats, Mr. Calderon, who chairs the California Assembly Insurance Committee, had the endorsement of some insurance groups.

Political insiders generally give Democrats the edge in the commissioner's contest, citing the fallout from the resignation under a cloud by Republican Insurance Commissioner Chuck Quackenbush.

Mr. Mendoza's win came despite the defeat in the gubernatorial primary of Richard Riordan, whom Mr. Mendoza served from 1996 to 1997 as a deputy mayor when Mr. Riordan was mayor of Los Angeles.