The Portuguese legislative election of 1985 took place on 6 October. In June of the same year, the former Prime-Minister, Mário Soares, had resigned from the job due to the lack of parliamentary support, the government was composed by a coalition of the two major parties, the center-right Social Democratic and the center-left Socialist, in what was called the Central Bloc, however this was an unstable balance of forces and several members of each party opposed such alliance. The new leader of the Social Democratic Party, Cavaco Silva, elected in May, was among those that never supported such alliance, and short after being elected leader of the party made the coalition fall in July. A new election was called by the President and the Social Democrats won with a short majority and Cavaco became the Prime-Minister. The election was the first of three consecutive election victories for the Social Democratic Party. Meanwhile, a new party had been founded by supporters of the President Ramalho Eanes, the Democratic Renewal Party, led by Hermínio Martinho that surprisingly gained 45 MPs and more than one million votes in the election and became the parliamentary support of the Cavaco's government until 1987, when it removed its support, making Cavaco fall. The Communists and the Socialists lost votes and MPs, and the left would only return to the government ten years later, in 1995.
Electoral system
The Assembly of the Republic has 250 members elected to four-year terms. Governments do not require absolute majority support of the Assembly to hold office, as even if the number of opposers of government is larger than that of the supporters, the number of opposers still needs to be equal or greater than 126 for both the Government's Programme to be rejected or for a motion of no confidence to be approved. The number of seats assigned to each district depends on the district magnitude. The use of the d'Hondt method makes for a higher effective threshold than certain other allocation methods such as the Hare quota or Sainte-Laguë method, which are more generous to small parties.
Parties
The major parties involved and the respective leaders:
The following table shows the opinion polls of voting intention of the Portuguese voters before the election. Those parties that are listed are currently represented in parliament. Included is also the result of the Portuguese general elections in 1983 and 1985 for reference.
