Hello again! I wanted to share again something I stumbled on while surfing. Hillsdale College is offering a series of recorded lectures on the United States Constitution at two separate levels (10 recordings for each level). The "courses" are free, but you will need to register to access the content. As well, they ask for donations if you are able to do so. Check out Constitution 101 and also Constitution 201 if you are interested! Enjoy, Messdiener
From my brief look at the course pages, I don't think that the college will directly credit you for listening to the audio courses, but the others' suggestions seem perfectly valid.