One theory of coalition-building indicates that, the more frequently people find each other on the same side of different issues, the stronger their ties become to each other and to the issues they have in common. suppose a campaign manager is measuring the strength of the coalition of local union members who support a state proposition. recent marketing surveys indicate that 60% of local union members support the proposition compared to one-quarter of non-union members who support the proposition. assume 20% of the voters in the community are members of a union. what percent of the voters in the community support the proposition?