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It would protect the country from the whims of the unintelligent who have no idea what is good for the nation.
A country run by the learned has a higher chance at being effective than a country governed by all. If the intelligent run the country, then the chances of a democratic mistake go down, because they are intelligent.
The intelligent could have the means to do good. Will they always have the motive?
In a democracy, everyone should be able to vote.
Past examples of such tests have been struck down, at least in the U.S., for racial discrimination.