The depth and diversity of views reflected in this thread, and similar discussions around the country, is probably the only good to come of this tragedy. And it is a tragedy, in every sense.
It believe this situation reflects the fundamental problems we are encountering as our medical capabilities out-pace our ethical or moral concensus. It is important to remember that many people feel passionately about the issues presented by this tragedy, whether due to their religeous/moral/ethical/personal beliefs, or due to their personal and professional experiences.
I have had to deal with similar situations from virtually every perspective except the patient's. I can only say that my wife and I have discussed it thoroughly and have communicated our wishes to our parents. We will be memorializing these wishes this week.
As a general matter I believe this is a question, like many issues surrounding life and death, that should be purely a matter for families, their physicians and the religeous/moral counselors they choose to consult. Far better for the courts and our government to remain uninvolved. Unfortunately, this is not possible today.
And for the record, I am a strong defender of the courts and our legal process, having sworn a couple oaths to that effect. After more than a decade of trial work at most levels, including trial court cases involving those in persistant vegetative states who are wards of the state, I am all too aware of the shortcomings of our legal system when it comes down to resolving questions of belief. Let alone the intersection of ethics, morality, and medical science. The only thing I am fairly certain of is that this tragedy is not easily boxed into "saint vs. sinner" or "greedy vs. loving."
[Start of rant - no "flame" intended, read at your own risk, etc...]
What I find actively pernicious is the politicization of this tragedy. While I do not believe all involved are politicizing it for political gain, ... some are. And those that are doing so for ethical or religious reasons should recognize the grave risks they are creating by politicizing such decisions and forcing the courts into playing "extra innings" through 11th hour federal legislation. For example, I'm sure those involved in this effort would find it reprehensible were the Congress and the Presidency firmly in the hands of pro-euthanasia politicians doing the same. Once you establish legal and political precedents it is almost inevitable that the procedures will be used in ways you never thought possible. And never would have condoned.
Oh, and a related question - Are these the same elected officials who believe in the sanctity of marriage? Wouldn't that mean that the husband (or wife) is best positioned, legally, morally, and ... dare I say, biblically, to make such decisions for their spouse? Well, ok, no one in the old testament would have let a woman make a decision about much of anything...
My two cents, other views welcome.