Plurality block voting is a type of block voting method for multi-winner elections. Each voter may cast as many votes as the number of seats to be filled.[1] The candidates with the most votes are elected. The usual result when the candidates divide into parties is that the most-popular party in the district sees its full slate of candidates elected, even if the party does not have support of majority of the voters.[2]
The term plurality at-large is in common usage in elections for representative members of a body who are elected or appointed to represent the whole membership of the body (for example, a city, state or province, nation, club or association). Where the system is used in a territory divided into multi-member electoral districts the system is commonly referred to as "block voting" or the "bloc vote". These systems are usually based on a single round of voting.
The party-list version of block voting is party block voting (PBV), also called the general ticket, which also elects members by plurality in multi-member districts. In such a system, each party puts forward a slate of candidates, a voter casts just one vote, and the party winning a plurality of votes sees its whole slate elected, winning all the seats.
In a block voting election, all candidates run against each other for m number of positions, where m is commonly called the district magnitude. Each voter selects up to m candidates on the ballot. Each of the voters have m votes, and are able to cast no more than one per candidate. They cannot vote for the same candidate more than once, as is permitted in cumulative voting.[3]
Voters are permitted to cast their votes across candidates of different parties (ticket splitting).[4]
The m candidates with the most votes (who may or may not obtain a majority of available votes or support from the majority of the voters) are declared elected and will fill the positions.
Due to multiple voting, when a party runs more than one candidate, it is impossible to know if the party had support of as many voters as the party tally of votes (up to number of voters participating in the election) or if it had support of just the number of voters equivalent to the votes received by the most popular candidate and the other candidates of that party merely received votes from subset of that group.
Example
Candidates are running in a three-member district; each of the 10,000 voters may cast three votes (but do not have to). Voters may not cast more than one vote for a single candidate.
Party A has about 35% support among the electorate, Party B around 25% and the remaining voters primarily support independent candidates.
Candidate
Party
Votes
%
Elected?
Candidate A1
Party A
3555
36%
3.
Yes
Candidate A2
Party A
3700
37%
1.
Yes
Candidate A3
Party A
3600
36%
2.
Yes
Candidate B1
Party B
2600
26%
4.
Candidate B2
Party B
2500
25%
5.
Candidate B3
Party B
2400
24%
6.
Candidate I1
Independent
2300
23%
8.
Candidate I2
Independent
2395
20%
7.
Candidate I3
Independent
1900
19%
9.
Candidate I4
Independent
1800
15%
10
Candidate I5
Independent
650
7%
11.
Candidate I6
Independent
600
6%
12.
TOTAL
28,000
TOTAL possible votes (3 per voter)
30,000
Voters
10,000
100%
Candidates of Party A won in a landslide, even though they only received a plurality (35–37%) among the voters (10,000). This is because most parties run as many candidates as there are open seats and voters of a party usually do not split their ticket, but vote for all candidates of that party.
By contrast, a single transferable vote system would likely elect 1 candidate from party A, 1 candidate from party B and 1 independent candidate in this scenario.
Effects of block voting
The block voting system has a number of features which can make it unrepresentative of the voters' intentions. Block voting regularly produces complete landslide majorities for the group of candidates with the highest level of support. Additionally, like first past the post methods, if there are many parties running and voters do not engage in tactical voting, a small cohesive group of voters, making up only a minority of the voters, can elect all the open seats by merely constituting a plurality.
Landslide victories
Under block voting, a slate of clones of the top-place candidate may win every available seat. A voter does have the option to vote for candidates of different political parties if they wish, but if the largest group of voters have strong party loyalty, there is nothing the other voters or parties can do to prevent a landslide.
While many criticize block voting's tendency to create landslide victories, some cite it as a strength. Since the winners of a block voting election generally represent the same slate or group of voters, there is greater agreement among those elected, potentially leading to a reduction in political gridlock.
Tactical voting and strategic nomination
Block plurality voting, like single-winner plurality voting, is particularly vulnerable to tactical voting. Supporters of relatively unpopular third parties have a substantial incentive to avoid wasted votes by casting all of their votes for a slate of candidates from a major party.
Parties in block voting systems can also benefit from strategic nomination. Coalitions are actively hurt when they have more candidates than there are seats to fill, as vote-splitting will occur. Similarly, a coalition has a substantial incentive to nominate a full slate of candidates, as otherwise supporting voters may cast some of their remaining votes for opposing candidates.
Bullet voting is a strategy in which a voter only votes for a single candidate in an attempt to stop them being beaten by additional choices. Because the voter is essentially wasting a portion of their vote, bullet voting is only a good strategy when the voter has a strong preference for their favorite and is unsure of, and/or indifferent to, the other candidates' relative chances of winning, for example, if the voter supports an independent candidate or a minor party which has only nominated one candidate. Thus, block voting may look like single non-transferable voting.
Block voting, or block plurality voting, is often compared with preferential block voting as both systems tend to produce landslide victories for similar candidates. Instead of a series of checkboxes, preferential block voting uses a preferential ballot. A slate of clones of the top preferred candidate will win every seat under both systems, however in preferential block voting this is instead the instant-runoff winner.
Vacancies
In Brazil, where Senatorial elections alternate between FPTP and block voting, each main candidate is registered along with two substitutes. Votes in either election are cast and counted based on these three-candidate slates; when a Senator leaves office before their eight-year term ends, the first substitute takes their place, and then the second if needed.
On the other hand, in political systems with a culture of by-elections, filling vacancies under Block Voting can be harder than in other voting methods. This is because by-elections to fill a single seat in a multi-member district can be expensive. In the Philippine Senate that has staggered elections, the seat is filled up on the next scheduled election, such as in 1951, 1955 and 2001.
There are alternative ways of selecting a replacement in such systems: one way is to fill any seat that becomes empty by appointing the most popular unsuccessful candidate in the last election, i.e. a countback. This was used in the City of Edmonton (Canada) following the 1905 Edmonton municipal election.[6]
The Philippines is the country with the most extensive experience in plurality-at-large voting. Positions where there are multiple winners usually use plurality-at-large voting, the exception is the election for sectoral representatives in the House of Representatives. The members of the Senate and all local legislatures are elected via this method. The members of the Interim Batasang Pambansa (the parliament) were also elected under this method in 1978.
The following countries use block plurality voting (not including party block voting using plurality) in their national electoral systems:
Modified two-round block voting (BV) in multi-member districts, modified two-round system (TRS) in single-member districts (25% of votes required to win in 1st round in every constituency)
Two-round block voting (BV) in multi-member districts, two-round system (TRS) in single-member districts (50% of votes required to win in 1st round in every constituency)
46 (44 directly elected + 1 delegate from Banaba Island and 1 ex officio)
Two-round block voting (BV) in multi-member districts, two-round system (TRS) in single-member districts (50% of votes required to win in 1st round in every constituency)
Two-round system (TRS) in single-member districts, two-round block voting (BV) in dual-member districts, and List PR (simple quota largest remainder; closed-list) in larger districts + twice 20 nationally List PR (one set of 20 reserved for women)
Two round block plurality voting (BV) candidates have to get at least 28% of the votes in a district to get elected. If there are unfilled seat, a runoff is held with twice the number of candidates as there are unfilled seats[7]
Hungary, for local elections in municipalities under 10,000 residents. The system is officially called "individualized list electoral system" or "electoral system using personalized lists" (Hungarian: egyéni listás választási rendszer), which can be loosely interpreted as meaning personalized block voting, as opposed to party list systems, such as party block voting (general ticket) or party list PR.[8]
In France, the election of municipal councilors takes place by majority vote[9] plurinominal, in two rounds with panachage:
In the first round, candidates are elected if they receive an absolute majority of votes cast and the vote of a quorum of at least a quarter of registered voters;
In the second round, a simple majority suffices. If multiple candidates receive the same number of votes, the election is won by the older of the candidates when no one can be elected based on the number of seats[10]
In British Columbia, Canada, all local governments are elected using bloc voting for city councils and for other multi-member bodies (there called "at-large" voting). In other Canadian provinces, smaller cities are generally elected under plurality-at-large, while larger cities are generally elected under the "ward system" which is a municipal adaptation of single member plurality. The sole exception is London, Ontario which has recently changed to the Alternative Vote. When Toronto was amalgamated in 1997, the new entity's first election used a similar rule. From 1871 to 1988, British Columbia had some multi-member ridings using plurality-at-large, and others elected under single member plurality, with the number of each varying from one election to the next. Other Canadian provincial legislatures have in the past used plurality-at-large or single transferable vote, but now all members of provincial legislatures are exclusively elected under single-member plurality.[citation needed]
In Hong Kong, block voting is used for a tiny proportion of the territory's population to elect the members of the Election Committee, which is responsible for selecting the territory's Chief Executive.[citation needed]
Block plurality voting is or was also used in the election of the Senate of Poland (until 2011), the Argentine Chamber of Deputies (between 1854 and 1902, and between 1906 and 1910), of the Parliament of Lebanon, the plurality seats in the Palestinian Legislative Council and for the National Assembly of Mauritius. In some Lebanese and Palestinian constituencies, there is only one seat to be filled; in the Palestinian election of 1996 there were only plurality seats, but in 2006 half the seats were elected by plurality (two by first past the post; the others by block voting, in districts that ranged in size from two to nine seats); half by proportional representation nationwide. (The usual one-party sweep produced by block voting is seen in Hebron in the 2006 election where one party took all the district's nine seats.)[13]
A form of block plurality voting was used for the elections of both houses of Parliament in Belgium before proportional representation was implemented in 1900. The system, however, was combined with a system similar to a runoff election; when not enough candidates had the majority of the votes in the first round to fill the seats, a second round was held between the highest ranked candidates of the first round (with two times as many candidates as seats to be filled). In some constituencies there was only one seat to be filled. A similar system to elect part of the Mongolian parliament. 48 Representatives are elected from districts with 1–3 members, the representatives are required to achieve at least 28% of the vote in a district to be elected, if there are unfilled seats after the first round of voting, a second round similar to the Belgian system is held to fill the remaining seat. The remaining representatives are elected separately using party list proportional representation on the national level.[7]
Block voting was used in some constituencies for the House of Representatives of Japan in the first six general elections between 1890 and 1898: while the majority of seats was elected by plurality in 214 single-member districts, there were 43 two-member districts that elected their representatives by block voting.
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