Electoral volatility and parties' ideological responsiveness

For a number of decades now, scholars have been indicating that ties between citizens and parties are eroding. As a consequence, electoral behaviour has become more volatile and also more unpredictable. The consequences of this process of change on parties' strategic behaviour have, however, received little attention. In this article, the impact of dealignment on parties' strategic behaviour is examined, with the focus being on the extent to which parties are responsive to the mean voter. The expectation of dealignment allowing parties to move around more freely' leads to the hypothesis that parties are more responsive in a context of dealignment. The analyses provide evidence that is in line with this expectation. Ideological responsiveness is conditioned by the level of volatility in the electorate. The conclusion to draw from these results is that dealignment, which profoundly affects voters' behaviour, leads parties to become more responsive to the mean voter.