Bristol Palin is perhaps America’s most famous teen mom. She became a “teen-abstinence ambassador” in 2009 for the Candie’s Foundation, and she appeared in a People magazine cover story in which she confided that a teen mom’s job is hard work.

A law professor at the University of St. Thomas in Minneapolis, where she is described as a “passionate advocate for the protection of human life and the family.” She has assisted attorneys general in several states in defending laws restricting abortions.

Ann Stone is the head of Republicans for Choice in Alexandria, Va., which says its aim is to remove politics from the abortion debate.

Chair of the board of Physicians for Reproductive Choice and Health. Contact through Amanda Davis, the group’s media manager.

The Rev. John Putka is a Marianist priest and lecturer in political science at the University of Dayton in Ohio. Putka specializes in analyzing Catholic voting patterns and believes abortion is a key issue influencing the Catholic vote.

Posts publications and resources on its Web site, including a list of links. Beth Robbins is media contact.

The Rev. Charles E. Bouchard, O.P., is a moral theologian and president of the Aquinas Institute of Theology, a Dominican graduate school in St. Louis.

The ACLU Reproductive Freedom Project believes reproductive freedom is a core civil liberty and works to ensure that everyone has access to reproductive health care. Louise Melling is director. See a list of ACLU offices across the country.

Links to groups working to end abortion.