A CNET News article published in June reported that the name of an LMG employee, Alexandra Esser, appeared in the metadata of the letter ostensibly written by the corn growers and other grassroots groups. LMG Vice President Gil Meneses told us at the time that Esser "merely PDF'd a copy before distributing it" to reporters.
This is a great argument for using text instead of attachments. That or you could do real public relations and build an actual coalition of groups that actually share your client's point of view.
The days of turning a blind eye to astroturf are at an end.