Finally, another bishop, Rene Gracida, retired Bishop of Corpus Christi, Texas Corpus Christi is a coastal city and the county seat of Nueces CountyGR6 in the U.S. state of Texas. It is part of the region known as South Texas. , wrote a clarifying statement that is helpful:
"There is only one thing that could be considered proportionate enough to justify a Catholic voting for a candidate who is known to be pro-abortion, and that is the protection of innocent human life. That may seem to be contradictory, but it is not. "Consider the case of a Catholic voter who must choose between three candidates: candidate A who is completely for abortion-on demand; candidate B, who is in favour of very limited abortion, i.e., in favour of greatly restricting abortion; and candidate C, a candidate who is completely against abortion but who is universally recognized as being unelectableun
Being such that election, as to high office, is difficult or impossible: The candidate’s private life rendered him unelectable.
… Click the link for more information… "The Catholic voter cannot vote for candidate A because that would be formal cooperation in the sin of abortion if that candidate were to be elected and assist in passing legislation, which would remove restrictions on abortion-on-demand. “The Catholic can vote for candidate C, but that will probably only help ensure the election of candidate A. Therefore the Catholic voter has a proportionate reason to vote for candidate B, since his vote may help to ensure the defeat of candidate A and may result in the saving of some innocent human lives if candidate B is elected and introduces legislation restricting abortion-on-demand. In such a case, the Catholic voter would have chosen the lesser of two evils, which is morally permissible under these circumstances.”
see for more of the discussion:
thefreelibrary.com/Abortion+and+%22proportionate+reasons%22.-a0124488625