 Complete the following phrase:  The election was called several months ahead of schedule on 27 August 1982, by the then Prime Minister Leopoldo Calvo-Sotelo, amid poor opinion poll ratings and severe infighting within his party, the Union of the Democratic Centre UCD, that had seen the splits of former prime minister Adolfo Suárezs Democratic and Social Centre CDS, Óscar Alzagas Peoples Democratic Party PDP and the Democratic Action Party PAD of former minister Francisco Fernández Ordóñez. The closing legislature had been characterized by political instability and the effects of an economic downturn resulting from the 1979 oil crisis: Suárez himself had resigned the premiership in January 1981 as a result of the ongoing UCD crisis, a 