Assemblyman Bob Wieckowski and Republican businessman Peter Kuo were leaders in early returns Tuesday night in the 10th Senate District primary, with former Assemblywoman Mary Hayashi trailing in third place.

If the results hold up, it will be a disappointing result for Hayashi, a Democrat who pleaded no contest in January 2012 to misdemeanor grand theft charges after she was caught shoplifting $2,500 worth of merchandise from Neiman Marcus in San Francisco.

If he prevails in the primary, Wieckowski, D-Fremont, will be the favorite to replace Ellen Corbett, D-San Leandro, who will be termed out of her seat representing southern Alameda County and part of the South Bay.

Meanwhile, in the race for Wieckowski's spot in the 25th Assembly District, Kansen Chu and Bob Brunton were running first and second, respectively. Chu, a Democrat, serves as a San Jose city councilman. Brunton, a Republican, is a former Ohlone College board member. The 25th district includes parts of Alameda County and the South Bay.

Evan Low, a Democrat, and Chuck Page, a Republican, were running first and second, respectively, in the South Bay's 28th Assembly District.

Assemblyman Bill Quirk had received the most votes by far in early returns in the 20th Assembly District, followed by Jaime Patiño, a Republican financial analyst.

Assemblyman Kevin Mullin, D-South San Francisco, was crushing his competition in the 22nd Assembly District race on the Peninsula.

Assemblyman Rich Gordon, D-Menlo Park, was comfortably ahead in the 24th Assembly District race. Diane Gabl, a Palo Alto attorney was running a distant second.

There were just two candidates in each of four other Assembly races featuring a Democratic incumbent. The primary was a formality in those contests.

  • In the 19th district, Assemblyman Phil Ting, D-San Francisco, was leading in the race against Rene Pineda, a Republican.

  • In the 27th district, Assemblywoman Nora Campos, D-San Jose, led her Republican challenger G. Burt Lancaster.

  • In the 29th district, Assemblyman Mark Stone, D-Scotts Valley, was leading Palmer Kain, a Republican.

  • In the 30th district, Assemblyman Luis Alejo, D-Watsonville, was ahead of Republican Mark Starritt.