Evidently, the geographical confusion that has gripped college football has extended into the realm of condiments. Duke's Mayonaise, the beloved cultish secret of Southern cooks, is now available in parts of the South that are north of Canada! They are selling it -- openly -- in Pennsylvania! The new slogan is "the secret of great cooks." As a reasonably serious question, what happens when/if Duke's is available at supermarkets nationwide? What portion of the Duke's mystique lies where you cannot get it? The only intentionally regional brand that went national that comes to mind is Coors, and that's complicated b/c of Nazis and stuff.
In other regional news, regional supermarket chain Bi-Lo defines local like so. The Bi-Lo HQ is in Florida, and the chain's reach extends well beyond these states, but there is something reminiscent of the idea of the home counties in this notion. It's not as good as, you know, locally grown food, but better than trucking everything in from California.