in effect there is; you have to be of sound mind, i.e. legally responsible.
what you are talking about doing is removing the right to vote from ~60% of eligible voters, and justifying it based on the idea that your opinions are so nuanced and 'deep' that only people with above average IQ can even comprehend them. worse than that you equate rejection of your opinions as evidence of a reduced intellectual ability, and thus ineligibility to vote.
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