I suggest you read the statement by the U.S. Conference of Catholic Bishops, “Faithful Citizenship: A Catholic Call to Political Responsibility”,
(www.usccb.org/faithfulcitizenship/bishopStatement.html)
Here are some selected quotes:
“We believe that every human life is sacred from conception to natural death, that people are more important than things, and that the measure of every institution is whether it protects and respects the life and dignity of the human person.”
. . .
“Every person has a fundamental right to life–the right that makes all other rights possible.”
. . .
"In protecting human life, “We must begin with a commitment never to intentionally kill, or collude in the killing, of any innocent human life, no matter how broken, unformed, disabled or desperate that life may seem.”
. . .
“Laws that legitimize abortion, assisted suicide, and euthanasia are profoundly unjust and immoral. We support constitutional protection for unborn human life, as well as legislative efforts to end abortion and euthanasia.”