IN My experience, when I make an announcement like that, my liberal friends and family lie in wait for months trying to "catch" me buying something that they can prove is traced back to a "suspect" cause".
You can only do what you can. We switched from Costco to Sam's Club because my husband objected to Costco's politics. I refuse to support the Susan G Komen foundation because of ties to Planned Parenthood. But we certainly can't do exhaustive research into a company's money trail every time we get our oil changed or purchase a box of cereal. But we try to keep our ears open and be aware.
I do as well - and looking at the list of corporate sponsors Komen has, it looks like some of us will be giving up our choice of athletic shoes, clothes, cars, and all sorts of other products and services.