I think this fits the category:
Text of the 26th Amendment to the US Constitution- - -
Section 1. The right of citizens of the United States, who are eighteen years of age or older, to vote shall not be denied or abridged by the United States or by any State on account of age.
Section 2. The Congress shall have the power to enforce this article by appropriate legislation.
The intent was to give voting rights in all local, state, and federal elections to American citizens 18 years of age and older.
So why not state it.
Federal document should apply to all things federal, unless specifically outlined (rights of states). Representatives, Senators, President and his sidekick are covered. It doesn't even specify elections. All laws in congress are voted on. Section one says that our right to vote on legislation shall not be denied or abridged by the fact we weren't elected to congress. Supreme court decisions are voted on. Etc. Etc.
By the way I'm waiting for our commonwealth (Puerto Rico) and territorial citizens to note that they are excluded from voting in violation of this amendment.
Would it have been so hard to write:
Section 1. The right of citizens of the member states of the United States, who are eighteen years of age or older, to vote in local, state, and federal elections, shall not be denied or abridged by the United States or by any State on account of age.