Catholics, too.
George W. Bush beat "Catholic" Kerry among Catholics thanks to a concerted effort publicizing their respective stands on abortion, euthanasia, embryonic stem cell research, etc.
Churchgoing Catholics voted strongly for Bush. You ask us to vote Giuliani and you're gonna get laughed out of town. Many will revert to voting Democrat, and many more will vote for a third option, any pro-life third option, or just stay home.
As the Catholic wife of a very practical Catholic Knight of Columbus, I can tell you that I would never in a thousand million years vote for Giuliani even if he were to run against the devil herself Mrs. Clinton.