Okay, finally an update. Yesterday I spoke with the assistant dean again and she gave me some extremely helpful information. (Luckily I don't listen to some of the people on these message boards who are so deathly afraid of upsetting the law school pecking order.) The assistant dean pointed out that there is a mandatory grading policy for upper division courses. Apparently at my school, in upper division courses with more than 20 students, the professor CANNOT give more than 8% of the class a grade of C- or below. Since a low pass equates to a C-, this means that no more than 8% of the class can receive a low pass.
At my meeting with the professor today, he finally showed me the grade break down. Yes, as many people have speculated on these boards, my grade WAS one of the lowest in a cluster of extremely close grades. A twist to the situation is that the professor actually gave FIVE low passes. I don't know who the other two low passes are, but I feel bad for them.... they're probably thinking that they got the only low pass in the course.
Anyways, of the five low passes mine was the highest (luckily). In the meeting I pointed out the grading policy for upper division courses (the guy is a visiting professor....don't know if I mentioned that before)and turns out he wasn't aware of it. Surprise, surprise... I let the professor know that he exceeded the 8% maximum for C- or below and he was receptive to what I told him. Since he had given 5 low passes in a class of 27 students, that means he had given more than 18% of the class a low pass grade!
After I made all this clear, he told me he would verify the grading policy with the dean, and if it required him to change the grade he would change the grade.
Since the assistant dean was the one that brought the grading policy argument to my attention, I still don't want to count my chickens but...it seems like a grade change is inevitable.