I am thankful these folks don't have children and not just because they vote liberal. Self centered parents are not good for society.
That is complete and total crap. Some people just don't get the urge to procreate. Also, some people don't get married until late in life and the biological ticker goes into "expire."
People who have kids when they can't afford them and ask me to pay the tab, people who have kids on purpose to bring them up in one or zero parent housholds, people who have kids when they are too old (such as Tony Randall) -- these are selfish (sometimes to the point of downright evil) people.
And there is no evidence, anecdotal or otherwise, that child-free couples vote liberal.
Married over 20 years with no children ... both my wife and I are conservatives and vote republican. So your assumption that married couples without kids are liberals who drive a Volvo, and voted for Kerry doesn't hold water. In fact we have friends of many years, who, like us, didn't have children. They're strong Bush supporters ... they live in a very blue New England state.