A Giuliani presidency would be even more of a disaster in terms of unborn life than a Hillary presidency.
Lets assume that Hillary wins in 08. 4 years of pro-abortion governance pass. Now, there are three possible outcomes for 2012: either she will run for re-election, another Democrat (who will assuredly be pro-life) will win, or a Republican (who will most likely be pro-life) will win. Odds are that a pro-life Republican will be elected either in 2012 or 2016. Now, assuming Giuliani wins: we will again see 4 years under a pro-abortion president. However, he will most likely run for reelection. So, in 2012 the choices will be for either a pro-abortion Democrat or a pro-abortion Republican. Either way, we are guaranteed at least 8 years under a pro-life government.
It is clear that abortion policy will be less negatively impacted by even a Hillary presidency than a Giuliani presidency.