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In page Spoiler effect:

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In cases where there are many similar candidates, spoiler effects occur most often in first-preference plurality (FPP).[citation needed] For example, in the United States, vote splitting is common in primaries, where many similar candidates run against each other. The purpose of a primary election is to eliminate vote splitting among candidates from the same party in the general election by running only one candidate. In a two-party system, party primaries effectively turn FPP into a two-round system.[1][2][3]