Washington State is a mediocre Pac-12 team. But that's good enough to cover this margin at home against California, which is 0-10 on the road. 
The Golden Bears have lost four in a row and lack the size and talent to take advantage of Washington State inside. 
The Cougars are 11-3 at home, including going 5-1 SU and ATS in their last six home games. They have been up-and-down but own victories against UCLA, Arizona State, Washington, Oregon and Oregon State. 
I like the Cougars to cover this spread even if guard Issac Bonton has to miss a second straight game with a leg injury. He missed the Cougars' last game this past Saturday. Washington State lost 70-51 to USC in that matchup. That game, though, was at USC and Bonton's freshmen replacements will be better prepared if called upon. 
The Cougars still have CJ Elleby, who is averaging 18.7 points and 7.5 rebounds, to give them the best player on the court.