Republicans happier than Democrats

New study confirms - Republicans are happier than democrats.

...Happiness is a complex thing. Past studies have found that happiness is partly inherited, that Republicans are happier than Democrats, and that old men tend to be happier than old women.

...If you're thinking that Republicans are happy just because they perhaps make more money, that does not seem to be the case. The study that found Republicans to be happier than Democrats also showed that it held true even after adjusting for income.

Anyone want to venture a guess as to why this may be the case? Do you think the happiness differential exists or are people of one party more honest than people of the other party? 

(The rest of the article is here)