Ha, this is a funny thread! I have to go with Laurie and Rick on this one and say to me, Missouri is southern, and they DO have accents. I worked at a bar in the Mall of America for years and got to know all sorts of accents and then see their ids, so I got an idea of what people sounded like.
I think northern minnesotans and wisconsinians have accents, I have a small one, I say ruff instead of roof and a few other things people here in Florida make fun of me for, like pop instead of soda!