"The Court recalls that the rights set out in Article 3 of Protocol No. 1 are not absolute, but may be subject to limitations. The Contracting States enjoy a wide margin of appreciation in imposing conditions on the right to vote, but it is for the Court to determine in the last resort whether the requirements of Protocol No. 1 have been complied with. It has to satisfy itself that the conditions do not curtail the right to vote to such an extent as to impair its very essence and deprive it of effectiveness; that they are imposed in pursuit of a legitimate aim; and that the means employed are not disproportionate. In particular, such conditions must not thwart “the free expression of the people in the choice of the legislature” (see the above-mentioned Mathieu-Mohin and Clerfayt judgment, p. 23, § 52). "