I don't use it much. I figure that most American companies support a long list of ridiculously left-wing causes, so much so that my decision not to buy a Ford, for instance, would account for very little.
(I have an exception for Chick-fil-A, which I go to when I can because I love the waffle fries almost as much as the respect for Sundays and traditional values.)
This could change, however, now that they have added Immigration as an issue. [NEW: 2ndVote Adds Immigration as Scoring Issue, July 6, 2016]
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Their researchers compiled a list of companies that support LULAC and La Raza. Sadly, the list is a Who's Who of big corporations: Anheuser-Busch, Ford, Coca-Cola, Wal-Mart, Bank of America... It's almost as if the more American-sounding the company, the more likely they are to be on the list.