To grasp the nature and effect of populist challengers, this Case performs statistical inference and network analysis methods on a corpus of texts containing political expressions (speeches, party manifestos, statements in the media) to identify dimensions of political space. Its aim is to understand the raise of new political movements and parties which challenge established political divisions and to examine the reconfiguration of political spaces by identifying the main dimensions. It will also apply empirically informed modeling of the rise and fall of new political parties and movements as co-evolution of opinions, underlying representations and interaction patterns.