Double simultaneous vote

Double simultaneous vote (DSV) is an electoral system in which multiple offices – such as the president and members of a legislature – are elected through a single vote cast for a party. It can be combined with other electoral systems; in Uruguay DSV is used to elect the president and members of the Senate and Chamber of Representatives, with the presidential election also using the two-round system; if no party/presidential candidate receives a majority of the vote, a second round is held for the presidential election.[1]

The initial republican constitutions of several countries in the Commonwealth of Nations, such as Kenya,[2] Guyana[3] and Zambia,[4] provided for presidential elections by double simultaneous vote. Occasionally, as in Tanganyika,[5][6] a variant was used whereby the candidate who won a majority of constituencies (as opposed to a plurality of votes) would be elected.

Some Latin American countries used a DSV variant known as Ley de Lemas, in which parties may have sub-groups (sub-lemas) whose votes count towards the party's overall total.