On the sixth floor of the Leighton Criminal Court Building sits a resource revered by the Cook County judiciary — unless, of course, the resource is standing. “If someone has a question in this building or even outside the building, the first person they should go to is Dennis Porter,” Cook County Associate Judge Stanley Sacks said. Porter, 67, has been an associate judge since 1988. In that time, he has established himself as a judge’s judge — “the dean of the building,” as …