Do parties change their platform in anticipation of electoral losses? Or do parties respond to experienced losses at the previous election? These questions relate to two mechanisms to align public opinion with party platforms: (1) rational anticipation, and (2) electoral performance. While extant work empirically tested, and found support for, the latter mechanism, the effect of rational anticipation has not been put to an empirical test yet. We contribute to the literature on party platform change by theorizing and assessing how party performance motivates parties to change their platform in-between elections. We built a new and unique dataset of >20,000 press releases issued by 15 Dutch national political parties that were in parliament between 1997 and 2014. Utilizing automated text analysis (topic modeling) to measure parties' platform change, we show that electoral defeat motivates party platform change in-between elections. In line with existing findings, we demonstrate that parties are backwardlooking.
AbstractDo parties change their platform in anticipation of electoral losses? Or do parties respond to experienced losses at the previous election? These questions relate to two mechanisms to align public opinion with party platforms: (1) rational anticipation, and (2) electoral performance. While extant work empirically tested, and found support for, the latter mechanism, the effect of rational anticipation has not been put to an empirical test yet. In this paper, we contribute to the literature on party platform change by theorizing and assessing how party performance (electoral results, standing in the polls and government participation) motivates parties to change their platform in-between elections. We built a new and unique dataset of >20,000 press releases issued by 15 Dutch national political parties that were in parliament between 1997 and 2014. These data are particularly apt to identify parties' strategies in-between elections and therefore allow us to test both mechanisms; something that is impossible by examining changes in parties' election manifestos -the typical data such studies use. Utilizing automated text analysis (topic modeling) to measure parties' platform change, we show that electoral defeat motivates party platform change in-between elections. In line with existing findings, we demonstrate that parties are backwardlooking. Still, we find this effect only for opposition parties and, interestingly, no indication that this effect weakens over time. Moreover, our findings demonstrate that electoral prospects fail to influence party platform change, disconfirming the rational anticipation mechanism. Additionally, the findings provide important insights on the role of government participation.