A Minnesota-Iowa border flap has erupted over a perceived slight to Iowa's largest city. Minnesota Governor Arne Carlson said during the weekend that Des Moines is dead. Iowa Governor Terry Branstad sought an apology yesterday, but it was rebuffed. Carlson later hedged on his remarks, noting that his wife is from Iowa and proud of her heritage. Des Moines mayor Arthur Davis has offered Governor Carlson a tour of his city, and Carlson is apparently considering the offer. James Lileks, a columnist with the St. Paul Pioneer Press, has been watching the situation.