Previous literature has documented the existence of a bias against the left in majoritarian systems relative to Proportional Representation (PR) systems. However, much less is known about this type of underrepresentation within PR countries. This neglect is particularly troubling given the fact that most PR systems are districted and present a considerable variation in terms of magnitude across districts. In this paper, we build on Kedar (2016) and examine the underrepresentation of left-wing parties across different district magnitudes in PR countries. However, we essentially depart from them by significantly increasing the total number of election years we analyze. With this novelty, we are able to examine potential temporal dynamics in this regard, but also to pay attention to the mechanisms at play. Finally, we also take into account historical data to deal with potential endogeneity problems.