Are you absolutely, positively sure that you got all nuts and washers removed? It may sound like a stupid question, but I've fallen into that trap before. "I know I got all the bolts removed, why won't it come off." After taking a break, or getting a fresh set of eyes to look, "Hey, what about this one?"... "DOOHH!!!" Remove one more and it magically comes free.
Otherwise it's just rusted to the stud. A little heat around that stud hole may loosen it up, if you can get in there without burning the car down. You don't want to turn her into a car-b que.
Good luck,
Merle