Mark DeSaulnier (DEM)              

Percent: 66.47%             

Votes: 242,325                 

Katherine Piccinini (REP)           

Percent: 33.53%             

Votes: 122,219                 

Total votes: 364,544

Results by county

Alameda County          

Mark DeSaulnier (DEM)              

Percent: 67.37%             

Votes: 12,354    

Katherine Piccinini (REP)           

Percent: 32.63%             

Votes: 5,983       

Total votes: 18,337

Contra Costa County  

Mark DeSaulnier (DEM)

Percent: 66.43%             

Votes: 229,971                 

Katherine Piccinini (REP)           

Percent: 33.57%             

Votes: 116,236                 

Total votes: 346,207