Lloyd Mayer has posted this draft on SSRN. Here is the abstract:

One of the many aftershocks of the Supreme Court’s landmark decision in Citizens United v. FEC is that the decision may raise constitutional questions for the long-standing limits on speech by charities. There has been much scholarly attention both before and after that decision on the limit for election-related speech by charities, but much less attention has been paid to the relating lobbying speech limit. This article seeks to close that gap by exploring that latter limit and its continued viability in the wake of Citizens United. I conclude that while Citizens United by itself does not undermine the limit on lobbying by charities, the decision does reinforce the constitutional requirement that the government allow charities to easily form a non-tax favored alternative for engaging in unlimited lobbying. Some post-Citizens United proposals for regulating speech-related activity may in fact run afoul of this requirement. More importantly, the intersection of Citizens United and this tax-based limit on charity speech may be a catalyst for renewed consideration of whether the unconstitutional conditions doctrine could be successfully refined in the subsidy context through an approach that considers the purpose of the subsidy and how important the speech-related limit is to the accomplishment of that purpose.