Dead Presidents

You find the strangest things when you read through laws. For example, you learn the U.S. won't grant a trademark that

[c]onsists of or comprises a name, portrait, or signature identifying a particular living individual except by his written consent, or the name, signature, or portrait of a deceased President of the United States during the life of his widow, if any, except by the written consent of his widow.

15 U.S.C. § 1052(c). I had no idea that the Presidential widows' lobby was that strong.