You need to extend your protest to other conservative organizations as well. Outfits like the Heritage Club and particularly Club for Growth and the National Chamber of Commerce are awful on the illegal immigration issue and they don't deserve your money either.
I took considerable pleasure in ejecting a couple of guys from the National Chamber of Commerce from my office a few months ago. They understood EXACTLY how I felt about illegal immigration and their disgusting role in promoting it and I believe it was absolutely clear to them that they were not welcome on my premises.
I'm not on any of those other groups' mailing lists, but I get what you're saying.