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In page Protest vote:

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Protest voting is common in Latin America, where over 5.5% of ballots in presidential elections since 1980 have been blank or spoiled.[6] During the 2000 presidential elections in Peru, candidate Alejandro Toledo withdrew over concerns about election integrity and encouraged his supporters to spoil their ballots as protest—an example of organized protest voting.[7] In that election, around 31% of ballots cast were spoiled or blank.[7]