supporting the belief that women should have the right to have an abortion (= the intentional ending of a pregnancy) if they need or want one

I think there's been a shift from pro-abortion votes to more of a middle ground. 我认为发生了选票从支持堕胎到中间立场的转移。

The pro-abortion lobby believe that women have a right to choose. 支持堕胎的游说团体认为，妇女有选择的权利。