When shifting backfires: the electoral consequences of responding to niche party EU positions

Recent research has shown that mainstream political parties shift their positions on European integration in response to threats from niche parties. Whether or not this strategy affects the electoral fortunes of mainstream parties remains unclear, however. Drawing on both spatial and issue competition models of party competition, this study examines how mainstream political party accommodation of niche party position on the issue of European integration affects mainstream party electoral success. Using fixed-effects panel regression models, we investigate the effect of mainstream parties becoming more Eurosceptic in the face of a radical right political party on the size of the mainstream party's vote share. We show that position shifts towards Euroscepticism are detrimental to centre-right mainstream party success when faced with a radical right party that has seen more electoral success. Our findings have important implications for our understanding of party competition and electoral responsiveness in the European Union.