With candidates bunched within the margins of error, the call for “tactical voting” gains strength. Abstaining or voting for a candidate who is not your own can influence the outcome. Seems complex? Just do the maths.
Tactical voting. The calculations that can change results — Debate
Tuesday, 6 January 2026RSS
Context & Explainers
Tactical voting (voto útil) means choosing a candidate or party other than your first preference in order to achieve a strategic outcome — for example, concentrating support to ensure a preferred candidate reaches a second-round runoff, or to prevent a disliked candidate from winning.
In Portugal, tactical voting is particularly relevant in presidential elections (where a two-round system is used) and in legislative elections (where proportional representation means small parties can lose votes to threshold effects in smaller districts).
Party leaders frequently urge tactical voting during campaigns, asking supporters of allied or similar parties to consolidate behind the strongest candidate to maximize seat counts or prevent rivals from gaining ground.
