So much for the idiot vote

I just filled out my absentee ballot here in New Jersey and there was this:

Constitutional Amendment Concerning the
Right to Vote for Certain Persons

Shall the amendment of Article II, Section I, paragraph 6 of the Constitution, agreed to by the Legislature, revising the current constitutional language concerning denial of the right to vote by deleting the phrase “idiot or insane person” and providing instead that a “person who has been adjudicated by a court of competent jurisdiction to lack the capacity to understand the act of voting” shall not enjoy the right of suffrage, by adopted?

So it is now the law in New Jersey that idiots and insane people can’t vote. Why fix what’s not broken?