Louisa

Another important piece of the boycott against the Coors Beer Company was left up to the public sphere. The public's role, and perhaps the most important role, can be broken up into several categories.The organizing of peaceful demonstration, monetary donations (in order to cover the costs of running a nation-wide boycott), the support of unions and workers, and simply the support of neither purchasing nor consuming Coors products. 

up to the public sphere.

Also, the leaders, whether they were directly effected and targeted by the Coors Company or not, helped to engage the public and took on the responsibility of the Coors Boycott.

At one point during the protesting and boycotting of all Coors products, several democratic politicians, including Congressmen, Senators, and Assemblymen, joined the cause and officially contributed their name into the growing list of supporters. Liberal democratic support was just the support the Coors Boycott needed. Who better to lend official support than elected officials who consequently held major positions of power in American politics? By gaining the public support of U.S. political representatives, those fighting against Coors earned more credible backing and possible cooperative allies for future stages of the boycott. 

specifically Chicano communities, the head figures/leaders of the Boycott itself, and the general public more broadly.

Opposition to the Adolph Coors Company mainly centered on three issues.  First, the company did not support the organization of labor forces often using a variety of union busting tactics. Second, critics claimed that Coors hiring practices discriminated against Hispanics/Latinos, African-Americans, women, and those of the LGBT community. Finally, members of the Coors family, particularly Joseph Coors, actively supported and funded conservative politicians and organizations that worked against basic rights of their workers that they had been discriminating against. 

which continues still today

The letters of support that came in from all around the country certainly created a boost in morale. Once the boycott against the Coors company had far-reaching and official support, the knowledge of progress gave the protesters here in Colorado a stronger point to argue. They could now better convince themselves that their voices were being heard and, most importantly, it could convince Coors that the protester's voices were being heard.