This curious fact might at first seem trivial, but it reflects a much broader and little-noticed demographic trend that has deep implications for the future of global culture and politics. It's not that people in a progressive city such as Seattle are so much fonder of dogs than are people in a conservative city such as Salt Lake City. It's that progressives are so much less likely to have children.
It's a pattern found throughout the world, and it augers a far more conservative future — one in which patriarchy and other traditional values make a comeback, if only by default. Childlessness and small families are increasingly the norm today among progressive secularists. As a consequence, an increasing share of all children born into the world are descended from a share of the population whose conservative values have led them to raise large families.
Ann Coulter wrote an article on this very subject a year or so ago. She opined that liberalism would contracept, abort, and delayed maternity itself out of existence. Mark Steyn writes on the same phenomenon across Europe. I can recall people reacting to both of them, calling them ridiculously hyperbolic. It turns out they were just ahead of their time.