Befor; I am completely Pro-Life.
I do think people of different political persuasions can be married. My wife and I share a similar religion (we are both orthodox Catholics), however, her inclination is to be more of a Democrat/socialist politically, although I don't believe she's voted for anything other than Republican or Constitution party for more than 10 years now. However, I do think you need to find out if this woman is pro-life. If one day you two discover the child she's carrying is less than perfect in the world's eyes - i.e. Downs, Spina Bifida, etc. - it will ruin your relationship if she decides to kill your child. And don't kid yourself, ultimately, that decision will be hers, not yours, to make.
Consider this. Could you love a woman who couldn't love your child?