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Populism as a phenomenon is increasing in Europe. This study is therefore centred on howpopulist parties affect mainstream parties when entering the parliament. Moreover this studyresearches how party behaviour theories such as the median voter theorem and cartel partytheory explains mainstream parties' transition on the political and ideological scale when apopulist party is included in the parliament. This study aims to identify populistic discourse in Swedish parties election manifestos. Additionally, examine if the degree of populisticdiscourse differs from the year 2010 when the populist party entered the parliament, the yearof 2018 and the year of 2022 when the populist party entered an alliance with the government.The methodical approach for this research has been a qualitative content analysis. The categories for populist communication strategy attempts to contribute with an operationalization, a measuring instrument of populism in the empirical material. Moreoverthe categories is based on Jan Jagers and Steffan Walgraves theory surrounding populism as a political communication-style. The eight units of analysis are the election manifestos of the Swedish parties: The christ democratic party, the moderate party and the sweden democrats. The empirical research shows that populism as a communication style appears within the election manifestos and that the degree of populist rhetoric differs within the mainstream parties from when the populist party entered the parliament in 2010 and government alliancein 2022.