Buchanan received 13,103 votes, or more than 52% of the votes cast, to Wilson's 11,906, or 47.4%. Wilson lost to Buchanan in 2008 when both ran for the 15th district seat for the first time.
In the 18th Assembly district that covers about 40% of Pleasanton, Assemblywoman Mary Hayashi easily defeated her Republican challenger Michael Havig. Hayashi received 62,277 votes, or 74% of the votes cast, to Havig's 21,501, or 25.6%.
Fremont Vice Mayor Bob Wieckowski was elected Assemblyman in the 20th district, which covers most of Pleasanton east of downtown, including Ruby Hill. Wieckowski received 48,569 votes, or 72.4% of those cast, to GOP opponent Adnan Shahab's 18,190, or 27%. Wieckowski succeeds state Assemblyman Alberto Torrico, who is termed out this year after completing six years in the Assembly.
State Sen. Ellen Corbett (D-San Leandro) also won re-election to a second four-year term with 88,352 votes, or 67% of those cast, to her Republican opponent Rob Maffit's 36,110, or 27.5%.