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I say read #14 Below: (Note: This is dated 2002 but was online for at least a couple years before, IIRC)

I say, YES!

Except in the case in which a voter is faced with all pro-abortion candidates (in which case, as explained in question 8 above, he or she strives to determine which of them would cause the let damage in this regard), a candidate that is pro-abortion disqualifies himself from receiving a Catholic¡¦s vote. This is because being pro-abortion cannot simply be placed alongside the candidate's other positions on Medicare and unemployment, for example; and this is because abortion is intrinsically evil and cannot be morally justified for any reason or set of circumstances. To vote for such a candidate even with the knowledge that the candidate is pro-abortion is to become an accomplice in the moral evil of abortion. If the voter also knows this, then the voter sins mortally.
Fr. Stephen F. Torraco, PhD
Father Torraco is currently Associate Professor of Theology at Assumption College, Worcester, Massachusetts. He is the Executive Director of the Society for the Study of the Magisterial Teaching of the Church (SSMTC). He is an instructor in Theology as well as Chaplain for one of SSMTC's affiliates, the cyberspace based Regina Coeli Academy, and a member of the faculty of Catholic Distance University in Hamilton, Virginia. He also serves as a consultant for the Pope Paul VI Institute in Omaha, and for the Cardinal Kung Foundation in Connecticut. He is the author of various books and articles in moral theology, medical ethics, the social teaching of the Catholic Church and the spiritual life.
http://www.ewtn.com/faith/QA/expertslist.htm