I looked it up because I was curious. They are a politically active organization funded by individuals, corporations, donor-advised funds and foundations. Being

I looked it up because I was curious. They are a politically active organization funded by individuals, corporations, donor-advised funds and foundations. Being a politically-engaged non-profit they do not disclose who their donors are. There's always risk of conflict between ideology and figuring out who's going to pay you to keep promoting it.