"Does this prove the memo is a fraud? Not at all. It is possible that somewhere in the House or Senate there is a Republican staffer dumb enough to have produced and circulated it. The question, though, is: what is the evidence that the memo is genuine? At this point, there is none. And, with all due respect to Mike Allen, "trust me" is no longer adequate proof.

UPDATE: Reader Kyle Kveton makes a rather astonishing point:

Why the "GOP Schiavo memo" is a fake: The Real S.529 is a bill introduced by Grassley on 3-3-05 to establish a US anti-doping agency. No competent staffer would create a talking points memo with the wrong S. number on it.
He's right. Maybe there is an explanation. But the burden now is clearly on ABC and the Washington Post to explain why they are not the victims of a hoax.

FURTHER UPDATE: The correct number is S. 539."

http://powerlineblog.com/
Also see:
http://www.fishkite.com/blog/index.php?p=701