"The rights guaranteed under Article 3 of Protocol No. 1 are crucial to establishing and maintaining the foundations of an effective and meaningful democracy governed by the rule of law. Nonetheless, those rights are not absolute. There is room for “implied limitations”, and Contracting States must be given a margin of appreciation in this sphere. In this field, Contracting States enjoy a wide margin of appreciation, provided that they ensure equality of treatment for all citizens. It does not follow, however, that all votes must necessarily have equal weight as regards the outcome of the election or that all candidates must have equal chances of victory. Thus no electoral system can eliminate “wasted votes” (see Mathieu-Mohin and Clerfayt, cited above, § 54). "
CoE (ECHR): Case of Kovach v. Ukraine, para. 49

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Case of Kovach v. Ukraine