34. Catholics often face difficult choices about how to vote. This is why it is so important to vote according to a well-formed conscience that perceives the proper relationship among moral goods. A Catholic cannot vote for a candidate who takes a position in favor of an intrinsic evil, such as abortion or racism, if the voter's intent is to support that position. In such cases a Catholic would be guilty of formal cooperation in grave evil. At the same time, a voter should not use a candidate's opposition to an intrinsic evil to justify indifference or inattentiveness to other important moral issues involving human life and dignity.

35. There may be times when a Catholic who rejects a candidate's unacceptable position may decide to vote for that candidate for other morally grave reasons. Voting in this way would be permissible only for truly grave moral reasons, not to advance narrow interests or partisan preferences or to ignore a fundamental moral evil.

36. When all candidates hold a position in favor of an intrinsic evil, the conscientious voter faces a dilemma. The voter may decide to take the extraordinary step of not voting for any candidate or, after careful deliberation, may decide to vote for the candidate deemed less likely to advance such a morally flawed position and more likely to pursue other authentic human goods.

37. In making these decisions, it is essential for Catholics to be guided by a well-formed conscience that recognizes that all issues do not carry the same moral weight and that the moral obligation to oppose intrinsically evil acts has a special claim on our consciences and our actions. These decisions should take into account a candidate’s commitments, character, integrity, and ability to influence a given issue. In the end, this is a decision to be made by each Catholic guided by a conscience formed by Catholic moral teaching.

38. It is important to be clear that the political choices faced by citizens not only have an impact on general peace and prosperity but also may affect the individual’s salvation.  Similarly, the kinds of laws and policies supported by public officials affect their spiritual well-being...

40. The consistent ethic of life provides a moral framework for principled Catholic engagement in political life and, rightly understood, neither treats all issues as morally equivalent nor reduces Catholic teaching to one or two issues. It anchors the Catholic commitment to defend human life, from conception until natural death, in the fundamental moral obligation to respect the dignity of every person as a child of God. It unites us as a “people of life and for life” (Evangelium Vitae, no. 6) pledged to build what Pope John Paul II called a “culture of life” (Evangelium Vitae, no. 77). This culture of life begins with the preeminent obligation to protect innocent life from direct attack and extends to defending life whenever it is threatened or diminished.

41. Catholic voters should use the framework of Catholic teaching to examine candidates’ positions on issues affecting human life and dignity as well as issues of justice and peace, and they should consider candidates’ integrity, philosophy, and performance. It is important for all citizens “to see beyond party politics, to analyze campaign rhetoric critically, and to choose their political leaders according to principle, not party affiliation or mere self interest” (Living the Gospel of Life, no. 33).

42. As Catholics we are not single-issue voters. A candidate’s position on a single issue is not sufficient to guarantee a voter’s support. Yet a candidate’s position on a single issue that involves an intrinsic evil, such as support for legal abortion or the promotion of racism, may legitimately lead a voter to disqualify a candidate from receiving support.