I wanted to vote for McCain, but my wife won't let me

I enjoy discussing politics and unfortunately for my wife she is often the only person around for me to talk with. Over the course of the past few months I have been trying to encourage my wife to take our upcoming election more seriously. I tried to tell her it is her civic responsibility and Christian duty, which is of course true, but really I think I just wanted her to have more to add to our talks on politics. She has begrudgingly responded to my chiding and has started taking a look at candidate positions.
I have liked McCain for a long time now. He has always had a legitimate shot at winning the Republican nomination, and I think also a general election. He has a good understanding of many of the important issues, especially the war in Iraq, the economy, and the health care system. He is pro-life which is obviously important. While he is in favor of overturning Roe and Doe, he is one of those individuals who thinks abortion is an issue for the states to decide.
As I talked with my wife about McCain she was not impressed. She, if I understand her correctly, would not vote for anyone who would not fight for making all abortion illegal, even if they have great views on every other issue. She told me I should not vote for McCain, and as I thought about it I thought she may be on to something. When you understand abortion for what it is, it seems reasonable that being right on every other issue is not enough if the candidate is not committed to protecting the lives of the most vulnerable of our population. As good an economic policy as Hitler may have had, it seems reasonable that his pro-genocide stance is enough to disqualify him from consideration.
Some make the point that it would be impossible to succeed at eliminating at this point so we should just try to do our best to reduce it. I do not find this argument very compelling. When William Wilberforce brought the first bill to abolish slavery before Parliament, he faced opposition that easily defeated his bill 163-88 (Much more lopsided than a vote on abortion would be today). He brought a similar bill to the floor nearly every year until it eventually succeeded. Wilberforce wanted to succeed, of course, but he was not motivated by being likely to succeed. He was motivated by the urgency of the cause. Perhaps his model is a better one to follow.
Should McCain win the primary I will again have to consider the pool of candidates, but given the other options in the primary I think I may have to search elsewhere to place my support this primary season.
Thoughts? Do you think McCain is pro-life enough to vote for in the primary? How about in the general election if he wins the primary?