Under the
1977 Political Reform Law, the
Spanish Cortes were conceived as a
provisional assembly tasked with drafting a new
constitution to replace the
Fundamental Laws of the Realm. The initiative for
constitutional amendment belonged to the
Congress of Deputies and the
national government, and constitutional bills had to be passed by an
absolute majority in both the Congress and the
Senate. If the Senate rejected a bill approved by Congress, the disagreement was to be examined by a mixed commission and, if the
deadlock continued, both chambers would meet in a
joint sitting as a single legislative body to decide the issue by absolute majority.
Date The term of the previous Spanish expired on 30 June 1977, after their term had been extended twice since their scheduled expiration date in November 1975. The election to the Spanish was officially called on 15 April 1977 with the publication of the corresponding
decree in the
Official State Gazette (BOE), setting election day for 15 June. Both chambers were scheduled to reconvene on 13 July.
Electoral system Voting for each chamber of the Spanish was based on
universal suffrage, comprising all
Spanish nationals over 21 years of age with full
civil and political rights. The Congress of Deputies had 350 seats in its first election. Of these, 348 were elected in 50
multi-member constituencies corresponding to the
provinces of Spain—each of which was assigned an initial minimum of two seats and the remaining 248 distributed in proportion to population, roughly one seat per 144,500 inhabitants or fraction above 70,000—using the
D'Hondt method and
closed-list proportional voting, with a three percent-
threshold of valid votes (including
blank ballots) in each constituency. The remaining two seats were allocated to
Ceuta and
Melilla as
single-member districts elected by
plurality voting. The use of this electoral method resulted in a higher
effective threshold depending on
district magnitude and vote distribution. As a result of the aforementioned allocation, each Congress multi-member constituency was entitled the following seats: 207 Senate seats were elected using
open-list partial block voting: voters in constituencies electing four seats could choose up to three candidates; in those with two or three seats, up to two; and in single-member districts, one. Each of the 47 peninsular provinces was allocated four seats, while in insular provinces—such as the
Balearic and
Canary Islands—the districts were the islands themselves, with the larger ones (
Mallorca,
Gran Canaria and
Tenerife) being allocated three seats each, and the smaller ones (
Menorca,
Ibiza–
Formentera,
Fuerteventura,
La Gomera–
El Hierro,
Lanzarote and
La Palma) one each. Ceuta and Melilla elected two seats each. Additionally, the
monarch could directly appoint a number of senators not higher than one-fifth of the elected seats. The law provided for
by-elections to fill
vacant seats in the Congress only when results in a constituency were annulled by a final
sentence following an
electoral petition; otherwise, vacancies arising after the proclamation of candidates and during the legislative term were filled by the next candidates on the
party lists or, when required, by designated
substitutes. Additionally for the Senate, by-elections were required to fill any seat vacated within the first two years of the legislative term. ==Candidates==