But, an escalating feud over disclosure of corporate campaign money issues has made it clear that a few million dollars in disclosed super PAC contributions are not all that’s at stake. More important is the money companies are being asked to give to politically active trade associations and nonprofit groups, which don’t disclose their donors and are spending tens of millions to influence key federal and state elections. Such groups have spent at least $80 million this year in what critics call “dark money”—campaign spending by organizations that keep their donors secret. That’s according to FEC reports on campaign spending by nondisclosing groups analyzed by the nonprofit Center for Responsive Politics. Additional millions also have been spent in federal and state races without any FEC reporting, according to analysts.