to exist both in

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This tendency towards negative coverage of politics has been proven to exist both in the United States and in Western Europe (Brandenberg, 2005; Lengauer, Esser, and Berganza, 2012; Patterson, 1994).
Esta tendencia hacia la cobertura negativa de la política se ha probado que existe tanto en Estados Unidos como en Europa occidental (Brandenberg, 2005; Lengauer, Esser, y Berganza, 2012; Patterson, 1994).
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