This essay will explain the electoral success of radical right parties in thirteen Western European countries over time. Based on a theory of convergence and polarization as a recent for the upsurge of radical right partiers. The two main factors that will be tested as potential explanations to the success of these parties are polarization and convergence along the leftright and the Gal-Tan dimensions respectively. The questions (and hypothesis) that will be answered in the essay are; Does left-right convergence between established parties lead to electoral success for Radical right parties (H1); Does Gal-Tan polarization lead to electoral success for radical right parties (H2). This research problem is approached then with statistical methods. The conclusion is that radical right parties benefits from polarization between parties in the party system on the left right and the Gal-Tan dimensions. Yet, the findings show that Gal-Tan polarization has a more profound effect than left-right polarization.