Drawing from the headlines, in Bekah Brunstetter’s “The Cake” Debra Jo Rupp gives a fantastic, full dimensional performance as a lovable, conservative baker who struggles with the decision to bake a wedding cake for her surrogate daughter’s same sex wedding.  Despite a great performance and a gorgeous production, the play contains a dated treatment of its gay characters and their milieu, presenting an incongruous and ultimately flawed portrait of the relevant issues at hand.