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Double simultaneous vote

Double simultaneous vote (DSV) is a feature of some electoral systems 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.

The initial republican constitutions of several countries in the Commonwealth of Nations, such as Kenya, Guyana and Zambia, provided for presidential elections by double simultaneous vote. Occasionally, as in Tanganyika, a variant was used whereby the candidate who won a plurality of constituencies (as opposed to a plurality of votes) would be elected. Such systems have also been used in Latin America.

Country	First election	Second election	Third election	Simultaneous votes
Angola	Members of the National Assembly	Party-list PR	President	FPTP			Closed list party vote + personal vote
Bolivia	President (first round)	TRS	Chamber of Deputies	AMS	Senate	Party-list PR	Personal vote + mixed single vote + closed list party vote
Guyana	Members of the National Assembly	Party-list PR	President	FPTP			Closed list party vote + personal vote
Uruguay	President (first round)	TRS	Chamber of Representatives	Party-list PR	Chamber of Senators	Party-list PR	Personal vote + 2x closed list party vote

Straight-ticket voting

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