It came to me one day that many issues that conservatives feel most passionate about seem to be motivated by fear. I did some Googling, and it turns out I'm not the only one to whom that thought has occurred. It's some interesting research and, external influences notwithstanding, could suggest that one some level we may be biologically predisposed to lean to one side or the other.
Does that mean that the opposite is true? Are liberals politically motivated by hope?