We investigate the effects of populist messages that (a) stress the centrality of "ordinary" people, (b) shift blame to the "corrupt" elites, or (c) combine people centrality and antielitist cues on 3 dimensions of populist attitudes: anti-elitism, homogeneous people, and popular sovereignty. We conducted an extensive 15-country experiment in which we manipulated populist communication as social identity frames (N = 7,271). Multilevel analyses demonstrate that messages stressing the centrality

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... f the ordinary people activate all dimensions of populist attitudes. In contrast, anti-elite messages activate anti-elitism attitudes only for those individuals with lower levels of education and extreme positions on the ideological left–right spectrum. Our findings suggest that populist political communication plays a key role in activating populist attitudes across Europe.