LOS ANGELES (AP) - The holders of the North American rights to the Winnie the Pooh characters have hired celebrity attorney Johnny Cochran to represent them in their 12-year legal fight with The Walt Disney Co. The heirs of Stephen Slesinger have alleged that Disney owes them millions of dollars because they miscalculated royalties due from the sales of Pooh dolls, books and other merchandise for years. Disney has denied the allegations. The Slesinger's hiring of Cochran is the second major change in lawyers the family has made this year. Cochran will face Daniel Petrocelli, who represents Disney in the...