I thought it was the other way around, in the US at least, though I have no statistics immediately at hand to prove it. I.e. that those strongly in favor of the death penalty by and large are equally strongly and vehemently opposed to women's access to abortion. Personally I think that this view on abortion many a time may have more to do with the wish to limit and control women and women's sexuality than with any concern for preserving human lives and with respecting the inviolability of human life on general principle. Clamoring simultaneously for the death penalty and against women's access to abortion points in that direction.
However I do agree that sentiments and arguments along the lines of my view on the death penalty may be entirely and sincerely relevant for someone who is opposed to abortion.
Perhaps there should be a separate poll on the views on abortion?
Well, it's interesting to discuss them together, because you're right, Americans who favor the death penalty tend to oppose legalized abortion (and vise versa).
I think that sometimes both views are sincere and noncontradictory. People think the death penalty is the best way to deal with heinous criminals, and they also think abortion is murder. Just as I don't see any contradiction in my own reverse viewpoints. (I'll admit, though, that I'm less pro-choice than I am anti-death penalty -- I can understand, though not fully support, arguments like Lee's, that abortion can be seen as killing for the sake of convenience.)
I don't see opposition to abortion as necessarily a desire to control women's sexuality. I do sometimes see it as the equivalent of a religion one is raised in and therefore accepts as reality. I think a lot of politics is like that -- in America and probably elsewhere, too. You are raised to think a certain way, to identify yourself as a certain kind of person, and that goes along with a set of beliefs that you accept as your own. I'm not saying this is how everybody develops their opinions, but I think it happens a lot.