It really gets down into a gray zone that bothers me and has bothered me for about three months now.
For me, a lot of it comes down to my faith. However, the Bible doesn't really touch on abortion, and the best method of the times would not have been able to calculate risk to the mother or risk to the child. Thus, I can see why it would have been 100% banned back in Jesus time or earlier.
For me, the question would be the same as Euthanasia (I think that's the right word). Should we be allowed to kill a child who would have a low chance for life, or who is putting the mother at risk?
Personally, I know a few people with down syndrome (No, not me), and I would not abort a baby with Down Syndrome. Especially since that test is relatively inaccurate.
However, for the numerous other life threatening diseases that can harm the mother or the child or both, I really could not say. Is it worth saving a baby with a 2% chance of life and a 0% chance at normal life to save the mother who would have a 50% chance to live. Right now I would have to say I'd lean towards an abortion, the key factor being that I'd probably love my wife/gf more than the unborn fetus. Looking not in hindsight, I'm already questioning whether my decision would be for the right reasons.
In the end though, I believe that a fertilized egg is a human being with the right to life. I go as far as to say an IED or a Plan B type of birth control should be considered abortion (Plan B destroys a zygote, IED's prevent Fertilized Eggs from implanting to wall). Other birth control is fine, I'm not as extreme as Catholics, but between timing, the pill, rings, condoms, spermicide and abstinence, I feel like you should have tried one of those instead.
Also, another main point I would argue, is that government standards should be much more lax than my own moral standards. There are a lot of situations out there that are difficult to make a legal decision, and having to search through pages of legal code to find your answer probably isn't the best option. Plus, Obama said (And I can't believe I'm quoting him), the woman will make the best decision. I don't agree that the woman can make the best decision. There is a lot of hormonal balances and personal fears that go along with a pregnancy, but people close to the situation should be able to come to a reasonable solution.
BTW, I used to be really super anti-abortion, but then I was educated on the topic by a few real life stories told on a few different news sites. Goes to show that these debates can amount to something, no matter how small.