643. Limits of states' margin of appreciation.

Although contracting states enjoy a wide margin of appreciation under Article 3 of Protocol 11 and are not as restricted in their choice of legitimate aims as they are under other qualified rights2, the European Court of Human Rights will nonetheless assess the legitimacy of the aim relied upon3 together with the lawfulness of the measure and its proportionality4. Any restriction on the right to vote must not curtail the right to such an extent as to impair its very essence and deprive it of its effectiveness