The reason given for not endorsing Boxer is that she:
has failed to distinguish herself during her 18 years in office. There is no reason to believe that another six-year term would bring anything but more of the same uninspired representation.Her voting record isn't a problem for them as she is a reliable liberal and they agree with her voting record.
The Chronicle thinks Fiorina would be much more effective and work well in the Senate. However, they don't like her positions on the issues. One of the one's that they don't like is gun control. They say:
her unwillingness to support even the most commonsense gun-control measures to keep assault weapons off the street or to deny guns to suspected terrorists on the federal "no fly list."Repealing ObamaCare and no immigration reform until the border is secure also make their list. In other words, Carly Fiorina represents mainstream positions on the issues according to most Americans but not the San Francisco Chronicle editorial board. One could only hope more Californians decide that Boxer is a hack and needs to be replaced than not.