Good on her for thinking this through with you.

She’s absolutely correct that the education of your children is very important, and could possibly be a problem further down the line. It is very, very good that she is so upfront with how strongly she feels in regards to this.
For me, a difference of opinion in regards to universal heath care and renewable energy are not deal breakers at all or by any means! However, the rank of values would be problematic for me, to say the least. If my husband could set his pro-life views aside and vote pro-abortion in favor of renewable energy and universal health care, I would never have married him (says the girl who loves the Canadian healthcare system and is in favour of being good stewards of creation).
No matter how much you sugarcoat it, he’d be tacitly stating by his actions that renewable energy is more important an issue than hundreds of thousands of babies’ lives. Furthermore, by voting pro-choice, he’d be actively participating in keeping a culture of death in place and in power. There is not a single faithful Catholic priest who would say that it is morally permissible to vote pro-abortion when there is a viable pro-life candidate running. We cannot, as Catholics, vote pro-abortion in good conscience. It is too grave a violation of human rights. There is a reason that Catholic Forums is running a banner that says “Form your conscience, Vote your Faith”.
I strongly, strongly recommend reading this article by a Catholic priest with a PhD on how Catholics can vote. Here is an excerpt that is particularly relevant:
“If a political candidate supported abortion, or any other moral evil, such as assisted suicide and euthanasia, for that matter, it would not be morally permissible for you to vote for that person. This is because, in voting for such a person, you would become an accomplice in the moral evil at issue. For this reason, moral evils such as abortion, euthanasia and assisted suicide are examples of a “disqualifying issue.” A disqualifying issue is one which is of such gravity and importance that it allows for no political maneuvering. It is an issue that strikes at the heart of the human person and is non-negotiable. A disqualifying issue is one of such enormity that by itself renders a candidate for office unacceptable regardless of his position on other matters. You must sacrifice your feelings on other issues because you know that you cannot participate in any way in an approval of a violent and evil violation of basic human rights. A candidate for office who supports abortion rights or any other moral evil has disqualified himself as a person that you can vote for. You do not have to vote for a person because he is pro-life. But you may not vote for any candidate who supports abortion rights.” Source: A Brief Catechism for Catholic Voters by Fr. Stephen F. Torraco, PhD
ewtn.com/vote/brief_catechism.htm