socialism," or a "decentralised socialist state," as a constitutional aim. This was in part as a consequence of Thatcherism's effect in Wales. While the party embarked on a wide-ranging review of its priorities and goals, Evans continued his successful campaign to oblige the Conservative UK government to fulfil its promise to establish S4C. Wigley's election was seen as instrumental in deciding the future direction of Plaid Cymru. Though Wigley described his own politics as 'right-wing', at the time he represented a moderate, pragmatic social democracy policy, in sharp contrast with rival candidate Dafydd Elis Thomas' far-left socialism. Wigley's triumph was also somewhat a pyrrhic victory – he won the presidency, but Thomas would have a greater influence over the party's ideology throughout the 1980s. In 1984 Wigley resigned from the presidency because of his children's health. In the 1984 party leadership elections Dafydd Elis-Thomas was elected president, defeating Dafydd Iwan, a move that saw the party shift to the political left. Wigley returned to the job in 1991 after the resignation of Elis-Thomas. Ieuan Wyn Jones captured Ynys Mon from the Conservatives in 1987. The 1991 census revealed that the decline in the number of Welsh speakers was arrested, and remained at the 1981 levels of 18.7% in a Welsh population of over 2.8 million. Gwynedd retained the highest concentration of Welsh speakers with 61%, followed by Powys, Clwyd, and Dyfed averaging in the mid-twenty percentile. The Yes for Wales campaign After the 1997 general election, the new Labour Government argued that an Assembly would be more democratically accountable than the Welsh Office, echoing calls for self-government since 1918. For eleven years prior to 1997 Wales had been represented in the UK Cabinet by a Secretary of State who did not represent a Welsh constituency at Westminster. Plaid Cymru joined a bi-partisan Yes for Wales campaign, alongside the Labour and Liberal Democrat parties. During the campaign for a Welsh Assembly, Diana, Princess of Wales was killed in a car accident in France. The campaign had been temporarily suspended and it was wondered what effect the death of the Princess of Wales would have on the election. Commentators pondered what effect the death of the princess and focus on the UK Royal Family would have on the devolution debate and turn out. A second referendum was held on 18 September 1997 in which voters approved the creation of the National Assembly