Yes the liberals were much happier. Does being miserable make my colleagues conservative, or does conservatism make them miserable?? I don't know the answer. I work in the same place, am very liberal, and, am, for the most part, much happier than they are.
The point is that there happen to be a lot of loud conservative voices in medicine, but apparently more physicians support democrats over republicans. My feeling is most physicians are truly libertarian in ideology, and neither party is ideal for most.