From The New York Times:

"Scholars on both the left and right have studied this question extensively, and have reached a consensus that it is conservatives who possess the happiness edge. Many data sets show this. For example, the Pew Research Center in 2006 reported that conservative Republicans were 68 percent more likely than liberal Democrats to say they were “very happy” about their lives. This pattern has persisted for decades. The question isn’t whether this is true, but why."

Obviously it's Democrats  that are bringing us down with all their negativity.  And this was written before Trump, so you can't use that as an excuse.