I came across this today. I wrote Molson Coors and told them I would not be buying any more of their beer. Apparently they give money for every beer sold to the "Castle Rock foundation." I just wrote Molson Coors and told them that I would not buy any more of their product as long as they were involved in Conservative US politics.

http://samuel-warde.com/2012/07/list-of-companies-supporting-right-wing-and-tea-party-causes-and-candidates-to-boycott/