In a really equal democracy, every or any section would be represented, not disproportionately, but proportionately. … Unless they are, there is not equal government, but a government of inequality and privilege: one part of the people rule over the rest: there is a part whose fair and equal share of influence in the representation is withheld from them, contrary to all just government, but, above all, contrary to the principle of democracy, which professes equality as its very root and foundation.

Ch. VII: Of True and False Democracy; Representation of All, and Representation of the Majority only (p. 248) - On Representative Government (1861)