I prefer the flies with honey approach. It's not my place to force my opinion on others and tell others where and how they can spend their money. I know who I do and don't support and that's good enough for me. Plus I think if it ever did come up in conversation that I would be taken more seriously and more likely to change someones thinking on an issue if I came across as someone sane when talking about it as opposed to the maniacle looney foaming at the mouth about the injustices of the world. Hiding stuff and posting notes isn't my style - plus someone will come along and tidy the shelves anyway, leaving a baffled employee wondering WTF was that person on about LOL.