I'll try not to make sarcastic remarks....

....but it won't be easy.

Republicans Report Having Better Mental Health Than Democrats, Poll Finds

Here is the Gallup poll on which the article is based.

From the poll:

The reason the relationship exists between being a Republican and more positive mental health is unknown, and one cannot say whether something about being a Republican causes a person to be more mentally healthy, or whether something about being mentally healthy causes a person to choose to become a Republican (or whether some third variable is responsible for causing both to be parallel).