Bullet voting

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Bullet,^[1] single-shot,^[2] or plump voting^[3] is when a voter supports only a single candidate, typically to show strong support for a single favorite.

Every voting method that does not satisfy either later-no-harm (most methods) or participation (such as instant-runoff voting) will encourage bullet voting or truncation in some situations.^[4][5]

In systems that fail later-no-harm, voters who feel strongly about their favorite candidate can use bullet voting to maximize the chances their favorite candidate will be elected, at the cost of reducing the chances that one of their later preferences will win.^[6][7]

In non-participatory systems (such as instant-runoff), voters can sometimes strategically bullet-vote to hide their support for additional candidates; this strategy works because such systems can cause candidates to lose when they receive too much support from voters.^[4][5]

In systems like cumulative voting, bullet voting is actively encouraged as a way for minority groups to achieve proportional representation, by allowing small groups to concentrate all their support on one candidate and win at least one seat on a city council.^[2][7][8] During the Jim Crow era, municipalities often banned or disparaged bullet voting in an attempt to prevent black voters from being able to achieve representation on city councils, creating a stigma that in some cases lasts to the present day.^[2][8]