I watched a segment where it was pointed out how liberal men tend to smile more. Now I'm not going to comment on their social status which is often the same, but I do reckon we're often happier in the matrix.
Can you link?
That's more likely to be pure correlation though. I doubt the cause of smiling is liberal mindset. Finns tend to be very liberal, but catching a Finn smiling is like trying to catch a 3-winged butterfly. It happens, but very rarely.
People smile for a variety of reasons. Liberals and conservatives form echo chambers and isolated social groups in the US. They have very different lifestyle habits, some of which have nothing to do with being liberal or conservative per se but could still be linked to smiling.