The Turing test is a proposal for a test of a machine’s capability to demonstrate intelligence. It proceeds as follows: a human judge engages in a natural language conversation with one human and one machine, each of which try to appear human; if the judge cannot reliably tell which is which, then the machine is said to pass the test. ¹
Have you ever considered that some humans would fail the Turing test? Seriously. What makes a biological machine with a functional data processing unit in the form of a brain a human anyway?
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The Magnificent Frog 
Yay! You found Dr. Fun. 🙂
Did anyone notice your colored foot?
Alan Turing was a genius, his Test such a small part of his published work. The first time I came across his name was as a callow youth (I’m now a callow seriously older but don’t look too bad for my age considering guy) in the work of Isaac Asimov in his “I Robot” works. Brilliant stuff.
But your question is penetrating. There are. by the evidence of my own eyes, people out there too stupid to vote. A number of these regularly do in the House of Commons.
How about ‘common sense’ tests for voters?
Have you seen this one?