This article examines trends in class voting in Switzerland between 1975 and 2011. Its aim is to test the respective theses of decline of class voting, persistence of traditional alignments and novel realignments. Based on log-multiplicative association models, it sets out to uncover variations in the structure and strength of alignments between social classes and political parties. The results highlight, firstly, the persistence of a complex pattern of traditional class voting involving the political left and the working class but also sociocultural specialists. This alignment, however, experiences slight but linear weakening. The results also demonstrate a secondary and complementary alignment, associating the populist right with blue-collar and unskilled workers. Unlike the first one, this one persists over time and is thereby strengthened.