hmm. thats actually a more difficult one.
john marshal isn't a very good school and getting a job in chicago is going to be relatively difficult compared to other schools competing in the city. on the other hand, i spoke with an attorney who graduated from Depaul and he said that the job placement for their students was pretty good.
while this would definitely militate transfering, you have to consider what might happen to your class rank if you left. since you are only top 1/3 at a T4 school, what would happen if you went up to a T2 school? I'm not saying you'll be top or bottom, you have to figure that out yourself. if you think you can maintain that class rank, by all means go. but if you think you may end up in the bottom 1/3 of the class, maybe staying put and increasing your class rank at a lower tiered school may, in fact, be more beneficial.