This Message Builder is a resource for advocates of a bold new U.S. leadership role in creating an open global economy that works for everyone -- including American workers. It is designed to facilitate the preparation of communications aimed at the mainstream American public. Drawing on existing opinion research and on other messaging resources developed by or in partnership with U.S. in the World, this document suggests big themes and ideas to convey and identifies messaging pitfalls to avoid. These broadly applicable recommendations are meant to be tailored to advocates' own voice and needs. At the same time, the common framework provided here should help diverse advocates communicate in mutually reinforcing ways, even if they disagree on policy details.