Less for teachers, more for janitors?

I get accused of a "divide and conquer" attitude if I even mention a question like this (and that's by my own husband). But this paragraph in today's Examiner story gives me pause:

San Francisco’s teachers union — which approved a resolution last week calling on district teachers to honor a strike by SEIU, if called — submitted a letter to the district on Tuesday vowing not to ask for equal dependent health coverage if the district came to an agreement with the service employees.

— Caroline