Silicon Valley saw some losses Tuesday, but made some inroads, too. After investing heavily in several key races, Big Tech suffered a set of bruising losses in the California primaries on Tuesday. Perhaps the most high-profile was that of San Jose Mayor Matt Mahan (D), who was in a distant sixth in the governor’s race, with roughly 4% of the vote, as of press time . A vocal opponent of a proposed statewide billionaire’s tax , Mahan entered the gubernatorial race in January as Silicon Valley’s