GREAT FALLS, Va. — Rick Santorum was, in his own words, a “nominal Catholic” when he met Karen Garver, a neonatal nurse and law student, in 1988. As they made plans to marry and he decided to enter politics, she sent him to her father for advice.

Dr. Kenneth L. Garver was a Pittsburgh pediatrician who specialized in medical genetics. The patriarch of a large Roman Catholic family, he had treated patients considering abortion but was strongly opposed to it.

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