At least as a charity they can act impartially, with little or no consequences.
Dear Sirs
As a business in a thriving marketplace, we are always mindful of our public image, and the implications of being associated with concerns that might bring our brand into question.
As a result of our investigation, it is with a sad heart that we have to end our contract to supply your .org address, as we feel our association with you is negatively impacting on our image.
I do hope your ...........(insert name of organisation that gets up the noses of Republicans and their ilk) can find a new home, with a company that isn't scared shitless of being blacklisted by Presidents and other amoeba, that have by some sheer fluke got a hold of some money and power.