Giuliani doesn’t really get it how important the life issue is to some voters. He doesn’t get that we don’t care that he’s a fiscal conservative (which is a point that’s open to debate), the only issue that many pro-life voters care about is the abortion issue and wouldn’t vote for a pro-choice candidate at any cost. It will be a matter of principle for them:

A day after Christian conservative leaders suggested they might support a third-party candidate if Giuliani got the Republican Party’s nomination Giuliani said he was not focusing the issue.
“I’m working on one party right now, the Republican Party,” he said after visiting patrons at Dino’s Seaville Diner. “This is a long primary, and once there are nominees on either side, we’ll figure that out.”
[…]
Although Giuliani was asked the question about social conservatives twice, he used each opportunity to address two other pertinent Republican issues — his fiscal conservatism and his electability against Hillary Clinton.
And after being asked if the potential of losing the Christian right vote harms his viability as a general election candidate, Giuliani returned to his competitiveness against Clinton.
“Every poll shows that I would be, by far, the strongest candidate against Hillary Clinton,” he said, adding, “There hasn’t been one taken in the last six or seven months that shows anything other than I’m the Republican that has the best chance to beat her.”

A pro-choice Republican won’t beat a pro-choice Democrat because there’s no reason for the pro-life Democrats to vote for the Republican. He loses not only our pro-life voters but there’s as well. I’ve blogged about that here.
And btw, it’s not just the pro-life voters that won’t be supporting Giuliani, the NRA members won’t be supporting him — there won’t be crossover from NRA Democrats as well.
Giuliani doesn’t bring too much to the nomination and I hope that will become clear as we approach the primaries.