ORINDA (CBS SF) – It appears Orinda Mayor Steve Glazer and Assemblywoman Susan Bonilla will advance from in Tuesday’ss primary election for a vacant state Senate seat representing parts of Contra Costa and Alameda counties.

Glazer garnered 32.8% of the vote with Susan Bonilla (24.9%) edging Joan Buchanan (22.6%). All three are registered Democrats.

READ MORE: UPDATE: 15 Injured, 20 Rescued After Fire Erupts Inside San Francisco Tenderloin Apartment Building

The candidates are seeking the 7th state Senate district seat vacated by Mark DeSaulnier, who was elected to the U.S. House of Representatives last November and endorsed Bonilla to replace him.

READ MORE: UPDATE: Willow Fire Grows Past 2,000 Acres Near Big Sur, Evacuations Ordered

Glazer, who has served on the Orinda City Council since 2004, emphasized infrastructure improvements and education reform in his campaign literature. He made headlines in 2013 as an advocate for a statewide ban on transit strikes amid two BART strikes that year.

Bonilla, who served as a Contra Costa County supervisor and mayor of Concord prior to her election to the state Assembly in 2010, is a former high school teacher whose platform for the state Senate seat focused primarily on education, including better funding for K-12 schools.

MORE NEWS: West Nile Virus Found in Mosquitos in Stockton

The 7th district includes the cities of Antioch, Brentwood, Clayton, Concord, Danville, Dublin, Lafayette, Livermore, Moraga, Oakley, Orinda, Pleasanton, Pittsburg, San Ramon and Walnut Creek.