Neither of them are really advertising products or services, so any regulation (under a "commercial speech needs regulation" paradigm) that would apply to them

Neither of them are really advertising products or services, so any regulation (under a "commercial speech needs regulation" paradigm) that would apply to them (or other NGOs we might hold near and dear) would be light or non-existent. There's a separate argument to be made about whether political speech should be free (mostly unregulated) for corporations... Japan as I understand it is a fairly good example of heavily regulated political speech. As far as I can tell, politics in the modern world is dysfunctional regardless of how light the restrictions on political speech and political organizations' funding and activities. Political speech has many of the same problematic aspects of commercial advertisements, so I think there's room for argument that Citizens United and other precedent on the issue are a disaster, regardless of how much it might help political organizations we like.