Labels have a purpose, and manufacturers who try to deceive their customers with misleading - or outright false - statements should be held accountable.
From The Consumerist:
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.
Below the big yellow "25%" and big white "LESS SODIUM" on the front of the can in smaller yellow text it says "than regular condensed soup."
They may be right about meeting statutory requirements, but that doesn't mean a reasonable consumer can't still be mislead by the label on the front of the can. The lawsuit seeks class action status.