(Assuming we rely on sapience as the chief criterion for privileging life, as you seem to imply)
You are also not in a sapient-testable state when you're under the effects of anesthesia, or in deep sleep.
You might object that you will be in such a state again once you wake up - in other words, that you have the future potential to be in a sapient state.
That, however, would also apply to a human baby, albeit given another time horizon, while it would not apply (to the same degree) to many other mammals, whose individual future potential is much more limited.
Why would you be worthy of protection (e.g. while in a medical coma) based on regaining testable sapience in a matter of weeks - or months - if a baby weren't?
Our local surroundings could be made into a dense volume of self-replicating computronium hosting as many bare-minimum sapients as possible, but only a few people here would argue that it's morally imperative to carry that out to full term.
Another difference is that the mature sapient has typically specified, or would specify, that it should be reinstated in advance, and works within the framework of society. If the baby survives any sort of abuse it undergoes until it is sapient, then it might be entitled to some damages, but until then, it lacks self-ownership and is susceptible to destruction by its possessors.
Or is the convention against discussing politics here silly?
I propose a test. I'm going to try to lay down some rules on voting on comments for the test here (not that I can force anybody to abide by them):
1.) Top-level comments should introduce arguments (or ridicule me and/or this test); responses should be responses to those arguments.
2.) Upvote and downvote based on whether or not you find an argument convincing in the context in which it was raised. This means if it's a good argument against the argument it is responding to, not whether or not there's a good/obvious counterargument to it; if you have a good counterargument, raise it. If it's a convincing argument, and the counterargument is also convincing, upvote both. If both arguments are unconvincing, downvote both.
3.) Try not to downvote particular comments excessively, if they're legitimate lines of argument. A faulty line of argument provides opportunity for rebuttal, and so for our test has value even then; that is, I want some faulty lines of argument here. If you disagree, please downvote me, instead of the faulty comments, because this post is what you want less of, not those comments. This necessarily implies, for balance, that we not excessively upvote comments. I'd suggest fairly arbitrary limits of 3/-3?
Edit: 4.) A single argument per comment would be ideal; as MixedNuts points out here, it's otherwise hard to distinguish between one good and one bad argument, which makes the upvoting/downvoting difficult to evaluate. (My apologies about missing this, folks.)
I'm going to try really hard not to get personally involved, except to lay down a leading comment posing an argument against abortion, a position I don't hold, for the record. The core of the argument isn't disingenuous, and I hold that this argument is true, it just doesn't lead to my opposing abortion. I do not hold the moral axiom by which I extend the basic argument to argue against abortion, however; I'm playing the devil's advocate to try to help me from getting sucked into the argument while providing an initial point of discussion.
Which leads me to the next point: If you see a hole in an argument, even if it's an argument for a perspective you agree with, poke through it. The goal is to see whether we can have a constructive political argument here.
The fact that this is a test, and known to be a test, means this isn't a blind study. Uh, try to act as if you're not being tested?
After it's gone on a little while, if this post hasn't been hopelessly downvoted and ridiculed (and thus the premise and test discarded as undesirable to begin with), we can put up a poll to see whether people found the political debates helpful, not helpful, and so on.