I doubt he's getting financial support from right-to-die organizations. Those organizations generally recognize the need for clear directives from the patient. Terri Schiavo makes a lousy test case for right-to-die law, since very few people think that the word of a slimy guy like Michael Schiavo should suffice as proof of a patient's wish not to have life-prolonging treatment in the event of severe disability. I firmly believe in the "right to die", and would certainly wish to be euthanized quickly (not starved and dehydrated to death slowly) if I were in Terri's condition, but I sure wouldn't give Michael Schiavo a penny.
Ah, but that's why it makes an "excellent" case. Since if Terri can be slaughtered, that clears the way for the many thousands of people whose death would be even the slightest bit less unreasonable.
My guess is that the connection is through his lawyer. He would like to become the Sarah Weddington of the "right to-die" movement. Of course, I am opposed to the whole notion of euthanasia. Apart from the principle, the many cases where "consent" is only a pretense. there is the lingering doubt that the process is as "painless" as it appears.