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 An Ultimate Light Beer Challenge for MillerCoors Struggles to Differentiate and Grow Former Rivals While Taking on A-B By Jeremy Mullman, Published on August 11, 2008 0 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.