How stable are 'left' and 'right'? A morphological analysis using open-ended survey responses of parliamentary candidates

The left-right scale is widely used to measure ideological orientation. Relying on Freeden's approach to political ideology as a 'conceptual morphology', we argue that the meaning of 'left' and 'right' may change, but these changes are more likely for peripheral than core concepts. To test this argument, we analyze open-ended questions on the meaning of 'left' and 'right' included in two waves of surveys of German parliamentary candidates collected before and after the 2015 European migration crisis. The empirical results based on Structural Topic Models show that the candidates' party affiliation colours the connotations of political concepts. In particular, we find that the core concepts ascribed to the meaning of left and right remained stable, while changes occurred with one peripheral concept in particular, namely, 'Racism', which is most often ascribed to the term 'right'. We conclude that morphological analysis can help better understand the concurrency of change and stability in ideological orientations and provides a fruitful linkage between electoral research and political theory.