In this response to Jay K. Dow's "Party Extremism in Majoritarian and Proportional Electoral Systems" (British Journal of Political Science, April 2011), Lawrence Ezrow evaluates the mediating effect of the relationship between party proximity and vote share. Adapted from the source document.
There is extensive theoretical research that explores the linkages between parties' policy positions, on the one hand, and the characteristics of the political system (i.e. voting rules and the number of parties) on the other, but empirical research on this topic is less developed. Building on earlier work by Jay Dow, this article reports empirical analyses exploring the connections between the average party policy extremism in fifteen party systems (defined as the average party policy distance from the party system centre), and two important system-level variables: the proportionality of the electoral laws used to select representatives to the national legislature, and the number of political parties. Contrary to expectations – but consistent with recent theoretical work by Norman Schofield and his co-authors – no evidence is found that average party policy extremism increases under proportional representation, nor that policy extremism increases in countries that feature large numbers of parties. These findings have important implications for political representation and for understanding parties' election strategies.
There is extensive theoretical research that explores the linkages between parties' policy positions, on the one hand, and the characteristics of the political system (i.e. voting rules and the number of parties) on the other, but empirical research on this topic is less developed. Building on earlier work by Jay Dow, this article reports empirical analyses exploring the connections between the average party policy extremism in fifteen party systems (defined as the average party policy distance from the party system centre), and two important system-level variables: the proportionality of the electoral laws used to select representatives to the national legislature, and the number of political parties. Contrary to expectations - but consistent with recent theoretical work by Norman Schofield and his co-authors - no evidence is found that average party policy extremism increases under proportional representation, nor that policy extremism increases in countries that feature large numbers of parties. These findings have important implications for political representation and for understanding parties' election strategies. (British Journal of Political Science / FUB)
Abstract. Do niche parties occupying left‐right policy positions that diverge sharply from the centre of the voter distribution gain more popular support than those moderately positioned along the left‐right continuum? Cross‐sectional analyses, based on observations from twelve Western European countries from 1984–1998, are presented that suggest the answer is 'yes'. By contrast, these analyses strongly suggest that for mainstream parties, policy radicalism depresses popular support. The implication of these findings is that for niche parties, it is the distinctiveness of their left‐right positions that enhances their competitiveness in democratic elections. While this finding runs counter to the intuition of standard spatial theory, it is consistent with recent dynamic accounts of niche party responsiveness to shifts in public opinion and electoral support for niche parties. These findings have implications for party strategies, spatial theories and the understanding of political representation.
