Your professor probably had you write the list of possible consequences to have you see how many different routes there are for political advocacy, many of which are legal and to avoid the illegal ones. If your professor explicitly stated you have to break the law to pass the course, then he/she could be fired.

Have you tried asking other students what their ideas are? There's a decent chance you're not alone in the class and who knows, their ideas may inspire you. Another way you can find ideas is to think of something you don't like at all, for most people this is violence, something sex-related, animal cruelty, etc... . Try thinking of something you like, then imagine it's hindered and try to look something up that relates to it.