Voters who support under-represented parties are more likely to express dissatisfaction with the political system

How does over and under-representation of political parties affect voter satisfaction with democracy? André Blais, Alexandre Morin-Chassé, and Shane P. Singh share research which shows that voters who support parties such as UKIP and the Green Party are less likely to express satisfaction with the political system as a whole, however voters who see their parties overrepresented by the system are likely to approve