It proposed to alter the electoral system for elections to Dáil Éireann from proportional representation (PR) under the single transferable vote to the British 'first-past-the-post' (plurality) system, based on single seat constituencies. It also proposed to establish an independent commission for the drawing of constituency boundaries on a constitutional basis. It was put to a referendum on 17 June (the same day as the 1959 presidential election) but was defeated. It was introduced by the Fianna Fáil government of Éamon de Valera but was opposed by Fine Gael, the main opposition party, and by the Labour Party. The Third Amendment Bill, 1958 was rejected by 486,989 (51.8%) against to 453,322 (48.2%) in favour.
A second attempt by Fianna Fáil to abolish PR was rejected by voters in the 1968 referendum on proportional representation.
|Third Amendment of the Constitution of Ireland Bill, 1958|
|Invalid or blank votes||39,220||4.00%|