The ruling People's Party (PP)—which for the first time contested a nationwide election in Spain while in government—emerged as the largest political force in the country, albeit with a diminished victory margin than in the previous election held in 1994. The Spanish Socialist Workers' Party (PSOE), in opposition for the first time since 1982, recovered some ground from its previous result. Overall, the PP lead decreased from 9.3 to 4.4 percentage points, though this was an increase from the 1.2 points between both parties in the 1996 general election. United Left (IU) lost half of its votes and parliamentary representation amid internal divisions—Initiative for Catalonia (IC) and the New Left (NI) had split from the larger alliance in 1997—policy differences over their relationship with the PSOE and the deteriorating health condition of IU's maverick leader, Julio Anguita.
The electoral law allowed for parties and federations registered in the interior ministry, coalitions and groupings of electors to present lists of candidates. Parties and federations intending to form a coalition ahead of an election were required to inform the relevant Electoral Commission within ten days of the election call. In order to be entitled to run, parties, federations, coalitions and groupings of electors needed to secure the signature of at least 15,000 registered electors; this requirement could be lifted and replaced through the signature of at least 50 elected officials—deputies, senators, MEPs or members from the legislative assemblies of autonomous communities or from local city councils. Electors and elected officials were disallowed from signing for more than one list of candidates.[1]
Below is a list of the main parties and electoral alliances which contested the election:
The table below lists voting intention estimates in reverse chronological order, showing the most recent first and using the dates when the survey fieldwork was done, as opposed to the date of publication. Where the fieldwork dates are unknown, the date of publication is given instead. The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour. If a tie ensues, this is applied to the figures with the highest percentages. The "Lead" column on the right shows the percentage-point difference between the parties with the highest percentages in a given poll. When available, seat projections are also displayed below the voting estimates in a smaller font.
6Commoners' Land–Castilian Nationalist Party results are compared to For the Europe of the Peoples totals in Cantabria, Castile and León, Castilla–La Mancha, La Rioja and Madrid in the 1994 election.
7Extremaduran Coalition results are compared to Extremaduran Regionalist Party totals in the 1994 election.
^ abResults for IU in the 1994 election, not including Catalonia.
^ abResults for CN in Aragon, the Canary Islands and the Valencian Community (1.42%, 0 seats) and PA–PAP (0.76%, 0 seats) in the 1994 election.
^ abResults for CN, not including Aragon, the Canary Islands, Galicia and the Valencian Community (1.35%, 2 seats), PEP, not including Cantabria, Castile and León, Castilla–La Mancha, La Rioja and Madrid (1.26%, 0 seats) and EV–CEC (0.23%, 0 seats) in the 1994 election.