The protest against these trends has come in interesting forms. Last year pro-choice Sen. Edward Kennedy joined with pro-life Sen. Sam Brownback to propose a bill that would have required medical professionals to tell expectant parents that genetic tests are sometimes inaccurate and to give them up-to-date information on the quality of life that people with Down syndrome can enjoy. The bill did not pass, but it was a principled gesture from Rosemary's brother.

Yet the pro-choice radicalism held by Kennedy and many others -- the absolute elevation of individual autonomy over the rights of the weak -- has enabled the new eugenics. It has also created a moral conflict at the heart of the Democratic Party. If traditional Democratic ideology means anything, it is the assertion that America is a single moral community that includes everyone. How can this vision possibly be reconciled with the elimination of Down syndrome children from American society? Are pro-choice Democrats really comfortable with this choice?

The family struggles of political leaders can be morally instructive.

Contrast the attitude of Joseph Kennedy with that of Charles de Gaulle, who treated his daughter Anne, born with Down syndrome in 1928, with great affection. The image of this arrogant officer rocking Anne in his arms at night speaks across the years. After her death and burial at the age of 20, de Gaulle turned to his wife and said, "Come. Now she is like the others."

And now we have met Trig, who is just like the others, in every way that matters.