Mid-Atlantic sounds all wet to me. As previously noted, there is really no such thing in the US. There are (IMHO) four distinct regional accents in the US - Southern, New York, New England and TV-Californian, distinguished by both pronunciation and word usage. There are local variants within these, mostly discernible only by locals...for example, a person from Boston would be able to (or claim to be able to) distinguish a Bostonian from a Providencer but someone from Ohio would not.

And Joe...ya don't tak like sumbuddy from Visconsin, ya heer? Ya hey!