The New Majority California, an influential group formed by moderate Republicans in Orange County a decade ago, is backing former Hewlett-Packard CEO Carly Fiorina in the three-way Republican race to replace U.S. Sen. Barbara Boxer. The group’s chairman, Larry Higby, said the decision was “a relatively close call” between Fiorina and former Rep. Tom Campbell, a fiscal conservative who supported gay marriage and abortion rights. “The main issue was that we felt that Carly had a much better chance to beat Barbara Boxer,” said Higby, adding that Fiorina’s business background and her debating skills were viewed as major assets. “I...