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Most parents whose unborn babies receive severe or fatal diagnoses decide to abort. Cheri Shoonveld of the National Society of Genetic Counselors estimates that just 10 percent to 20 percent of women carry to term after learning of a terminal prenatal diagnosis.

At a time when a baby’s genetic makeup can be discerned just weeks into pregnancy, disability is no longer seen as pitiful but instead as unnecessary and thus, by some, as immoral. As Robert Edwards, test-tube baby pioneer and 2010 Noble Prize winner, has said, “Soon it will be a sin for parents to have a child that carries the heavy burden of genetic disease.”

Intrepid cultural warriors, Mr. Santorum and Mrs. Palin stand bravely against a culture that increasingly sees genetic perfection as an entitlement.

Politicians who believe all people have inherent value, regardless of their capabilities, are rare. Those who live those beliefs are even rarer. We should celebrate them when we find them.

Daniel Allott is senior writer at American Values and an associate producer with In Altum Productions.