Depends. Zogby had a poll that got some exposure last April. When you add rape, incest, and life of the mother, brainwaves or hearbeat, the public is decidedly pro-life.
http://www.zogby.com/Soundbites/ReadClips.dbm?ID=8087
Even better is the GE ultrasound pictures at 6 weeks....looks like a minature of the full grown baby [less than size of a dime]. This is why PP is fighting mandatory law requiring these machines in their abortion facilities.