Opposition to Giuliani cannot be reduced to "single issue" voters. There are a number of issues besides abortion, including:
Partial Birth Abortion
Embryonic Stem Cell Research
Euthanasia (What IS Rudy's position on this one?)
Gun control
Amnesty/Safe havens for illegal border invaders
Homosexual Civil Unions and/or marriage
School choice (vouchers)
Personal character issues
History of selections and appointments (Bernie Kerik)
Business practices and conflicts of interest
We don't seem to get a straight answer from Giuliani's campaign or supporters.
"School choice (vouchers)"
He favors school choice.