83
Conservatives report higher happiness levels and self-reported mental health than liberals. No data charted for Hexbears
(hexbear.net)
There's more data points to this chart at the link
https://www.natesilver.net/p/what-explains-the-liberal-conservative
EDIT: added image
Wouldn't be surprised if conservatives are more likely to straight-up lie when asked if they're unhappy or admit to themselves that they're not.
And/or externalise any mental health issues they do have. "I'm not unhappy, it's the that are the problem!"