I can't imagine that you'd have any more than the normal problems. The guild itself is basically an advocacy group and is not producing any alcoholic beverages, and once your lawyer explains this to the IRS, you should be set.
As anyone setting up a 501(c)4 out there? Just out of curiosity, I'd like to know if there is a shield policy group to raise funds and promote beer policy. I hate to be part of the problem, but I also don't like asinine beer laws.