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Acaucus is a group or meeting of supporters or members of a specificpolitical party or movement. The exact definition varies between different countries and political cultures.
The term originated in theUnited States, where it can refer to a meeting of members of a political party to nominate candidates, plan policy, etc., in theUnited States Congress, or other similar representative organs of government. It has spread to certainCommonwealth countries, includingAustralia,Canada,New Zealand, andSouth Africa, where it generally refers to a regular meeting of allmembers of Parliament (MPs) who belong to aparliamentary party: a party caucus may have the ability to elect or dismiss the party'sparliamentary leader. The term was used historically in theUnited Kingdom to refer to theLiberal Party's internal system of management and control.

The wordcaucus came into use in the British colonies of North America to describe clubs or private meetings at which political matters were discussed. It is first found in reference to theCaucus Club ofBoston, which was established inc.1719, although the name is not documented untilc.1760. The origins of the word are uncertain, but there are three main theories:[1]
TheBoston Gazette of May 5, 1760, includes an essay commenting:
Whereas it is reported, that certain Persons, of the ModernAir and Complexion, to the Number of Twelve at least, have divers Times of late been known to combine together, and are called by the Name of theNew and Grand Corcas, tho' of declared Principles directly opposite to all that have heretofore been known: And whereas it is vehemently suspected, by some, that their Design is nothing less, than totally to overthrow the ancient Constitution of our Town-Meetings, as being popular and mobbish …
The writer goes on to argue that the underhand attempts of this "New and Grand Corcas" to influence voters are in opposition to the more laudable activities of "the old and true Corcas".[9][10][11]
A February 1763 entry in the diary ofJohn Adams demonstrates that the word already held its modern connotations of a "smoke-filled room" where candidates for public election were pre-selected in private:
This day learned that the Caucas Clubb meets at certain Times in the Garret ofTom Daws, theAdjutant of the Boston Regiment. He has a large House, and he has a moveable Partition in his Garrett, which he takes down and the whole Clubb meets in one Room. There they smoke tobacco till you cannot see from one End of the Garrett to the other. There they drinkPhlip I suppose, and there they choose a Moderator, who puts Questions to the Vote regularly, andSelectman,Assessors, Collectors, Wardens,Fire Wards, and Representatives are Regularly chosen before they are chosen in the Town …[12]
The following month, a writer signing himself "E. J." and claiming to be "a late Member" of the Boston "Corkass", explained in greater detail how the inner circle of the "Petty Corkass" manipulated the business of the broader "Grand Corkass":
At present the heads of this venerable Company meet some weeks before a Town-Meeting, and consult among themselves, appoint town officers, and settle all other affairs that are to be transacted at town meeting; after these few have settled the affairs, they communicate them to the next better sort of their brethren; when they have been properly sounded and instructed, they meet with the heads; these are called the Petty Corkass: Here each recommends his friends, opposes others, juggle and trim, and often have pretty warm disputes; but by compounding and compromising, settle every thing before the Grand Corkass meets; tho' for form sake … a number of warm disputes are prepared, to entertain the lower sort …[13][10]
William Gordon commented in 1788:
The wordcaucus, and its derivative caucusing, are often used in Boston […] It seems to mean, a number of persons, whether more or less, met together to consult upon adopting or presenting some scheme of policy, for carrying a favorite point. The word is not of novel invention. More than fifty years ago, Mr.Samuel Adams's father, and twenty others, one or two from the north end of the town, where all the ship business is carried on, used to meet, make a caucus, and lay their plan for introducing certain persons into places of trust and power.[14]
Ananalogical Latin-type plural "cauci" is occasionally used.[15]

In United States politics and government,caucus has several related but distinct meanings. Members of apolitical party or subgroup may meet to co-ordinate members' actions, choose group policy, or nominate candidates for various offices.
There is no provision for the role of political parties in theUnited States Constitution. In the first two presidential elections, theElectoral College handled nominations and elections in 1789 and 1792 which selectedGeorge Washington. After that, Congressional party or a state legislature party caucus selected the party's presidential candidates. Nationally, these caucuses were replaced by the party convention starting in 1832 following the lead of theAnti-Masonic Party 1831 convention.[16]
The termcaucus is frequently used to discuss the procedures used by some states to selectpresidential nominees such as theIowa caucuses, the first of the modernprimarypresidential election cycle, and theTexas caucuses.[17] Since 1980 such caucuses have become, in the aggregate, an important component of the nomination process.[18]
Another meaning is a sub grouping of officials with shared affinities or ethnicities who convene, often but not always to advocate, agitate, lobby or to vote collectively, on policy. At the highest level, inCongress and many state legislatures,Democratic andRepublican members organize themselves into a caucus (occasionally called a "conference").[19] There can be smaller caucuses in a legislative body, including those that are multi-partisan or evenbicameral. Of the manyCongressional caucuses, one of the best-known is theCongressional Black Caucus, a group ofAfrican-American members of Congress. Another prominent example is theCongressional Hispanic Caucus, whose members voice and advance issues affectingHispanics in the United States, includingPuerto Rico. In a different vein, the Congressional Internet Caucus is a bi-partisan group of Members who wish to promote the growth and advancement of the Internet. Other congressional caucuses such as theOut of Iraq Caucus, are openly organized tendencies orpolitical factions (within theHouse Democratic Caucus, in this case), and strive to achieve political goals, similar to a European "platform", but generally organized around a single issue.
The term is also used in certainCommonwealth nations, includingAustralia,Canada,New Zealand andSouth Africa. When used in these countries, "caucus" is more usually a collective term for all members of a party sitting in Parliament, otherwise called aparliamentary group, rather than a word for a regular meeting of thesemembers of Parliament. Thus, the Australian Federal Parliamentary Labor Party is commonly called "theLabor Caucus".[20]
The word was used in New Zealand from at least the 1890s, when organized political parties began to emerge: the largest of them, theLiberal Party, used it to refer to its parliamentary members.[21]
In New Zealand, the term is now used by all political parties,[22] but in Australia, it continues to be used only by theLabor Party. For the AustralianLiberal,National andGreen parties, the usual equivalent term is "party room". InSouth Africa all parties use the term "caucus".[23] In Canada, "caucus" refers to all members of a particular party in Parliament, including senators, or aprovincial legislature.[24][25] These members elect among themselves acaucus chair who presides over their meetings. This person is an important figure when the party is inopposition, and is an important link betweencabinet and thebackbench when the party is ingovernment.
In such contexts, a party caucus can be quite powerful, as it can elect or dismiss the party's parliamentary leader. The caucus system is a departure from theWestminster tradition in giving members of the upper house a say in the election of the party leader, who may become head of government. The caucus also determines some matters of policy, parliamentary tactics, and disciplinary measures against disobedient MPs. In some parties, the caucus also has the power to elect MPs to Cabinet when the party is in government. For example, this is traditionally so in theAustralian Labor Party and theNew Zealand Labour Party.

The word "caucus" had a wide currency in the United Kingdom in the late 19th century, meaning a highly structured system of management and control within a political party, equivalent to a "party machine" in the United States. It was used with specific reference to the structure of theLiberal Party. Originally a pejorative term, used by detractors of the system with overtones of corrupt American practices, the name was soon adopted by the Liberals themselves.
The system had originated at a local level inBirmingham in preparation for the1868 general election, when, under the1867 Reform Act, the city had been allocated threeparliamentary seats, but each elector had only two votes. In order to spread votes evenly, the secretary of the Birmingham Liberal Association,William Harris (later dubbed the "father of the Caucus") devised a four-tier organizational structure (ofward committees, general committee, executive committee, and management committee) through which Liberal voters in different wards could be instructed in the precise combinations in which to cast their votes.[26][27][28] In 1877 the newly formedNational Liberal Federation was given a similar structure, on the initiative ofJoseph Chamberlain, and again worked out in detail by Harris.[29]
Shortly afterwards the term "caucus" was applied to this system byThe Times newspaper, which referred to "the 'caucus' with all its evils", and by theConservative prime minister,Benjamin Disraeli.[30][31][32][33][34] In 1880Queen Victoria, following a meeting with Disraeli, wrote disapprovingly in a private note of "that American system called caucus".[35] The Liberal Caucus was also vilified bysocialists andtrade unionists, who (prior to the establishment of theIndependent Labour Party) sought a route to parliamentary representation through the Liberal Party via theLabour Representation League and theLabour Electoral Association, but found their way barred by the party's management structures.[36]
Moisey Ostrogorsky devoted some nine chapters of hisDemocracy and the Organization of Political Parties (1902) to discussion of the development and operation of the "Caucus" in this sense.[37]
The word "caucus" is only occasionally encountered in contemporary politics in the British Isles. In contrast to otherAnglosphere nations, it is never used for all members of a party in Parliament: the usual term for that concept, both in the UK andIreland, is "parliamentary party".
When the term is used, it generally refers to a subgroup,faction orpressure group within a political party. For example, in 2019 theOne Nation Conservatives andBlue Collar Conservatives were established as factions within theConservative Party, both being described as "caucuses".[38][39][40]
Inconventions, where the membership from different parts of the organization may gather, each separate group within the organization may meet prior to the convention as a caucus.[41] Each caucus may decide how the group would vote on various issues that may come up at the convention.[41] Unless the votes are made binding, however, each delegate is still free to vote in any fashion.[41]
The termcaucus is also used inmediation,facilitation and other forms ofalternative dispute resolution to describe circumstances wherein, rather than meeting at a common table, the disputants retreat to a more private setting to process information, agree on negotiation strategy, confer privately with counsel or with the mediator, or simply gain "breathing room" after the often emotionally difficult interactions that can occur in the common area where all parties are present.[42] The degree to which caucuses are used can be a key defining element, and often an identifier, of the mediation model being used. For example, "facilitative mediation" tends to discourage the use of caucuses and tries to keep the parties talking at a single table, while "evaluative mediation" may allow parties to separate more often and rely on the mediator to shuttle information and offers back and forth.[43]
There is to be a sort of Liberal Parliament organized, which, in American language, seems intended to act as a great Liberal 'Caucus'.
... what theTimes calls the new Liberal Caucus ...
We may say, and say truly, that the policy of the politicians of the Midland capital will bring upon us the 'caucus' with all its evils, but we cannot hope to checkmate it by giving it a bad name. The apologists of the system will tell us that the 'caucus' is a product of the peculiar conditions of life in America, which need not be apprehended in a society of totally different circumstances.
I observe that you, in common with the Prime Minister, have adopted the word 'caucus' to designate our organization.
... the word ['caucus'] chosen by the Prime Minister to describe [the Liberals'] system, and eagerly caught up by lesser critics ... conveys the idea of secrecy and irresponsibility ...
That the Liberals had worked on that American system called caucus, originated by the great Radical, Mr Chamberlain.
As one of its number points out, the Blue Collar group of Conservative MPs is bigger than almost any other caucus in the parliamentary party, including the One Nation bloc of self-styled moderates.
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