Campbell's reply is that the "25% less sodium" claim is as compared to the average of "all varieties" of condensed soup, not tomato. "Campbell has complete confidence in the accuracy of our labels and our marketing communications and that they meet regulatory and other legal requirements," the company told Reuters.
I'm calling bullshit on Cambell's reply. They knew exactly what they were doing, and who amongst us wouldn't assume their "25% less sodium" tomato soup contains less salt than their regular Campbell's tomato soup?
And the kicker? Campbell's "25% less sodium" tomato soup costs more.