The happiness of Irish voters

Happiness may seem to be in short supply in Ireland at the moment. But in general when Irish people are asked to ranked their happiness on a scale of 0-10 we average close to 8. Many predictors have been studied. Given the forthcoming election it is interesting to know if happiness differs according to how people vote. The European Social Survey asked people how they voted. Only one party is recorded so it is presumably their first choice.
Graphing happiness by party shows that Fianna Fail voters are the happiest of the lot followed by Fine Gael. Sinn Fein voters are the most miserable of the lot. These differences are statistically significant & are robust to controlling for age, sex and education. Of course this data was not collected recently and a contemporary survey might show a different pattern.