The Irish presidential election, 1966 reference article from the English Wikipedia on 24-Apr-2004
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Irish presidential election, 1966

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In the Irish presidential election in 1966 President de Valera reluctantly agreed under Fianna Fáil party pressure to seek a second term. Fine Gael decided to run one of its younger TDss, Tom O'Higgins against him. In an astonishing upset, O'Higgins came within 1% (or 10,000 votes) of defeating de Valera.