You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract What's Behind Target's Split With Wieden Retailer Leaves All of Adland Licking Its Chops By Natalie Zmuda and Rupal Parekh, Published on January 09, 2012 5 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.