http://www.nytimes.com/roomfordebate...-organizations
Further, the (c)(4) designation has no real purpose. The best explanation, in my view, for tax exemption for charities is that it is a sort of partial government subsidy for organizations that offer services that the private market will not offer, and that government either will not or cannot offer directly. I find it hard to believe that lobbying suffers from such a serious market failure that we need to subsidize organizations whose primary activity is to lobby. In fact, it seems almost perverse that the government would subsidize organizations whose primary purpose is to lobby the government.
So let’s make it simple: if you want to be a charity, be a charity and live with the 501(c)(3) limits; if you want primarily to be engaged in the political process through lobbying or otherwise, pay taxes like everyone else or register as a
527 political organization.