The Rise of Challenger Parties

This chapter discusses the rise of challenger parties. Challenger parties are those parties that have not yet held the reins of power: the parties without government experience. There are three main ways of distinguishing between challengers and mainstream parties in the existing literature. One focuses on the historical origins of the parties, another focuses on the specific issues they mobilize, and the third focuses specifically on populism as a distinguishing feature. The chapter then presents three examples of “waves” of challenger parties over the past century (social democratic parties, green parties, and populist radical right parties) and explores the commonalities in the strategies these parties have pursued, despite their very different ideological outlooks. It also considers the evolution of party competition in postwar Western Europe, demonstrating both the remarkable degree of stability the established party families enjoyed for much of the postwar period and then the increasing fragmentation resulting from the strengthening of challengers on both the right and the left.