you don't NEED one, but nice to have it. I lived on campus for 1 year and I didn't really like it. Housing is alot more expensive for what you get(old/small) and parking is usually additional $100-200 if you live in a big, company owned apartment.
Getting groceries without a car is kind of a pain in the ass. Major groceries like meijer, kroger, and costco are all off campus and would need a car.