Conservatives are more likely to be older, married and religious, all of which increases happiness [quote from "How Our Unconscious Votes," Newsweek May 26, 2008]
I found the above quote in an old Newsweek in a break area at work. I know this is almost a year old, but I've been out of touch. :-) Below is more of the context from the article.
In a 2006 survey by Pew Research Center, 47 percent of conservative Republicans described themselves as "very happy," but only 28 percent of liberal Democrats did. That led columnist George F. Will to write that "liberalism is a complicated and exacting, not to say grim and scolding, creed. And not one conducive to happiness." ... The right-left happiness gap existed not only in the United States but in nine other countries, too. In part, that's because conservatives are more likely to be older, married and religious, all of which increase happiness.