[darkleeroy]

It depends where most of your grade was pulled down. If he purposefully marked you down in subjective tests (essays, participation, whatever); you're pretty much screwed. If he was marking stuff incorrectly on something objective (anything that has an answer key) you may stand a chance. If he accused you (or a group of you) of cheating, you have to provide the information saying that you weren't.

Most of the time these end up being professor versus student, with an extreme advantage to the professor. Unless you're an athlete, child of someone who gives a lot of money to the school, or famous alumni; you're kinda SOL.

One C would bring down a 120 credit degree from a 3.6 down to a 3.57, hardly enough to make a big deal. If you're doing a 45 credit Master's it obviously would be a bigger but still not as big deal.