Earl Warren,
Lucas v. Forty-Fourth General Assembly of Colorado…
“ An individual's constitutionally protected right to cast an equally weighted vote cannot be denied even by a vote of a majority of a State's electorate, if the apportionment scheme adopted by the voters fails to measure up to the requirements of the Equal Protection Clause. Manifestly, the fact that an apportionment plan is adopted in a popular referendum is insufficient to sustain its constitutionality or to induce a court of equity to refuse to act. ”
