One exemption to anti-abortion views I've seen expressed almost universally among pro-lifers is that abortion is okay if the mother's life is at risk(because at that point, abortion isn't murder, any more than an operation that kills one Siamese twin to save the other is). A lot of people try to start blocking out other exemptions for semi-random reasons, mostly because of the hemisphere fallacy, but the arguments are usually the sort of incoherent nonsense you only hear from politicians.
That's why it makes sense to give them multiple laws that regulate abortion and ask them to rank them instead of asking them for their ideal abortion law.
They will have to give you reasons about why they prefer one exception over another even if they would reject both exceptions in a perfect world. That usually requires them to reason in a way that's more than just reiterating talking points.
As Multiheaded added, "Personal is Political" stuff like gender relations, etc also may belong here.