A major contributor to this article appears to have a close connection with its subject. (June 2020) |
Industry | |
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Founder | Jim Margolis |
Headquarters | , United States |
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GMMB, Inc. is a political communications and advertising firm based in Washington, D.C., with additional offices in Seattle and San Francisco.[1][2] Founded by Jim Margolis, it is the largest Democratic consulting firm in the United States.[3][4][5]