Both, and neither.
As for the official political positions, I can't stand completely with either one.
Neither "protected from conception" or "anything goes" makes any sense.
So I can't just pick a side.
First, there's a lot of mythology out there - like the idea that all the "unwanted" kids in the system is an argument against adoption as an option - the truth is that if you get rid of the bureaucratic red tape and expense and complication, there are enough parents and more for the kids in the system. In fact - there are plenty who specifically want a kid with special needs. And pointing to the older kids in the system who are hard to place says nothing one way or the other about infants who would otherwise have been aborted.
Likewise, all the real results in stem cell research have come from adult stem cells, not that harvested from abortions.
In any case, when you strip away all the misinformation from both sides I think that something like this makes sense:
First, short of saving the life of the mother, or saving her from permanent physical disability, no abortion should ever be preformed after the child has measurable brain waves (that's about 8-10 weeks depending on who you ask).
The way I see it, apply the same measure to the begining of life as you do to the end. If there's enough brain activity that we won't "pull the plug" on a person in a hospital, then the same amount of brain activity would enjoy legal protection in the womb.
By the way, women who have this sort of medical necessity make up something like 1% of all abortions.
Doing that still leaves a window of opportunity for the mother to make a decision when she finds out she's pregnant.
Ideally, most of those would be handled by morning after pills. I'd still be troubled that a small percentage of women would use this avenue as birth control - perhaps there should be some legal requirement attached to having one that tried to be sure that said women were on BC thereafter.
But still, that to me seems like at least a reasonable foundation that can be agreed on - pro-choice people still have a window for choice, and pro-life people know that at least no child is aware and suffering through a killing.