Fourth Amendment of the Constitution Bill 1968

The Fourth Amendment of the Constitution Bill 1968 was a bill (no. 6 of 1968) to amend the Constitution of Ireland to alter the electoral system for elections to Dáil Éireann, the house of representatives of the Oireachtas, from proportional representation by means of the single transferable vote (PR-STV) to first-past-the-post (FPTP). It was one of two referendums on the elections held on 16 October 1968, the other being a proposal to allow a greater variance in representation. Both bills were rejected.

Background
Elections to Dáil Éireann, the house of representatives in the Oireachtas, are governed by Article 16 of the Constitution.

In 1959, the Fianna Fáil government of Éamon de Valera put the Third Amendment of the Constitution Bill to a referendum, which proposed to replace the electoral system of proportional representation by means of the single transferable vote (PR-STV) with first-past-the-post (FPTP). The referendum was defeated by 51.8% to 48.8%, on the same day on which de Valera had won the presidential election.

In 1968, the Fianna Fáil government of Jack Lynch proposed two constitutional amendments on the electoral system for election to Dáil Éireann: the Third Amendment of the Constitution Bill, which would have allowed for greater divergence in the ratio of population to constituencies, and the Fourth Amendment of the Constitution Bill, a second proposal to introduce FPTP voting in single-member constituencies.

Oireachtas debate
The bill to amend the constitution was proposed in the Dáil by Taoiseach Jack Lynch on 21 February 1968. It was opposed by Fine Gael and the Labour Party. On 3 July, it passed final stages in the Dáil by 66 to 56. On 30 July 1968, it passed final stages in the Seanad by 25 to 18.

Voter information
The subject matter of the referendum was described in the voter information as:

Result
The Fourth Amendment bill was rejected by 60.8% against to 39.2% in favour; the Third Amendment, on the population ratio in constituencies, was rejected by a similar margin.