A CFI-supported study is mentioned in the article, but NPR also mentions other organizations, like the Cornucopia institute, that I can't find any bias on. There seems to be multiple sources for this NPR article here, meaning I don't think NPR has degraded to mouthpiece status just yet.

One additional note: this is a survey article, not based on a single study. This seems to be the case of NPR staff using a questionable reference, not just rewriting a press release.

The day the Senate torture report broke, NPR referred to torture as enhanced interrogation.

Poisoning the well much? Even if true, one biased article does not make them into "another mouthpiece."

It says more about you than anyone else if knowing the names of the founders makes the data seem unreliable.

Propaganda works both ways, and Sourcewatch has a massive blind spot when it comes to anti-corporate propaganda. Their page on Monsanto is full of uncritically repeated propaganda from the likes of Vandana Shiva.