I just want to reiterate what anyone with a brain--more than Mrs. Schiavo has, at least--should be able to figure out on their own.
There is no Terri Schiavo anymore.
Her cerebral cortex is gone. Liquefied, in fact. What you and I think of as "consciousness" or "mind" is, as Jeff Hawkins put it, what it feels like to have a cortex. If the news media wanted to capture the reality of the situation, they would say, "Her parents want to reinsert the feeding tube into Terri Schiavo's mindless body."
The Republicans don't have a problem sending people to be killed in war, they don't have a problem killing people convicted of crimes, they don't have a problem indirectly killing people by cutting Medicaid, but somehow when it comes to mindless fetuses and vegetative bodies Life Is Sacred.
The dead cow whose ground-up thigh muscle you ate in your last hamburger had a far greater interest in staying alive than fetuses and vegetables.