From Father Stephen Torraco at EWTN:
If a political candidate supported abortion, or any other moral evil, such as assisted suicide and euthanasia, for that matter, it would not be morally permissible for you to vote for that person. This is because, in voting for such a person, you would become an accomplice in the moral evil at issue.
If you don't personally know Fr. Torraco and think this is just another untrustworthy voice reaching out to you from the internet, then perhaps a little known Catholic source called the Congregation for the Doctrine of the Faith might help inform your choice.
John Paul II, continuing the constant teaching of the Church, has reiterated many times that those who are directly involved in lawmaking bodies have a grave and clear obligation to oppose any law that attacks human life. For them, as for every Catholic, it is impossible to promote such laws or to vote for them.
If you are inclined to “feel the Bern,” then for his own sake you should actually not want him to be elected, lest he feel a different kind of burn (see doctrine on purgatory and hell, read also Dante's Inferno). Whether or not we believe doesn't change the reality, and the punishment for those who bring harm to little ones is steep: “...it were better for him that a millstone should be hanged about his neck, and that he should be drowned in the depth of the sea.” (Matthew 18:6)
Why would we want someone to continue voting for, condoning, and working toward a country with more abortion? Better funded abortion? Do you really want to be sitting on your couch on election night thinking, “I hope my candidate won! Even though my vote will play a part in continuing abortion in this country, I really like his stance on big business!”
Because we're not talking about something sort of kind of Catholic, or sort of kind of natural law, or something about which we can all have a different opinion and still sleep well at night. We are talking about a holocaust. We are talking about millions of helpless lives.
It's the Year of Mercy. Ransom the captive. Harbor the harborless. “Put not your trust in princes, nor in the son of man, in whom there is no help,” Psalm 146:3
