Roughly a third of American voters think that the Marxist slogan “From each according to his ability to each according to his need” appears in the Constitution. About as many are incapable of naming even one of the three branches of the United States government. Fewer than a quarter know who their senators are, and only half are aware that their state has two of them.

Democracy is other people, and the ignorance of the many has long galled the few, especially the few who consider themselves intellectuals. Plato, one of the earliest to see democracy as a problem, saw its typical citizen as shiftless and flighty:

Sometimes he drinks heavily while listening to the flute; at other times, he drinks only water and is on a diet; sometimes he goes in for physical training; at other times, he’s idle and neglects everything; and sometimes he even occupies himself with what he takes to be philosophy.

It would be much safer, Plato thought, to entrust power to carefully educated guardians. To keep their minds pure of distractions—such as family, money, and the inherent pleasures of naughtiness—he proposed housing them in a eugenically supervised free-love compound where they could be taught to fear the touch of gold and prevented from reading any literature in which the characters have speaking parts, which might lead them to forget themselves. The scheme was so byzantine and cockamamie that many suspect Plato couldn’t have been serious; Hobbes, for one, called the idea “useless.”

A more practical suggestion came from J. S. Mill, in the nineteenth century: give extra votes to citizens with university degrees or intellectually demanding jobs. (In fact, in Mill’s day, select universities had had their own constituencies for centuries, allowing someone with a degree from, say, Oxford to vote both in his university constituency and wherever he lived. The system wasn’t abolished until 1950.) Mill’s larger project—at a time when no more than nine per cent of British adults could vote—was for the franchise to expand and to include women. But he worried that new voters would lack knowledge and judgment, and fixed on supplementary votes as a defense against ignorance. ...