Voting for a pro-abort is sinful

"Opposition to abortion binds every Catholic under pain of mortal sin and admits of no exceptions. It was for this reason that I stated in October of 2000 that you cannot vote for a politician who is pro-abortion when you have a choice and remain a Catholic in good standing. For some Catholics this is a hard teaching, but I am simply repeating church teaching: 'Human life is sacred because from the beginning it involves the creative action of God (Gospel of Life, par. 53)...the direct and voluntary killing of an innocent human being (abortion and euthanasia) is always gravely immoral (Gospel of Life, par. 57, 65)...protecting the mother's health does not justify the deliberate killing of an innocent human being (Gospel of Life, par. 58).'"
-- Bishop Robert J. Carlson, Sioux Falls, South Dakota