http://mlb.mlb.com/mlb/official_info...s/runner_7.jsp
Quote:
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NOTE: The catcher, without the ball in his possession, has no right to block the pathway of the runner attempting to score. The base line belongs to the runner and the catcher should be there only when he is fielding a ball or when he already has the ball in his hand.
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(emphasis added)
Note that in this case, judging from the context of the preceding paragraphs, "fielding the ball" seems to only be fielding the batted ball. Receiving a throw from a teammate does not qualify as "fielding" the ball.
Hence, it is a moot point. The base path was Holliday's, and the catcher blocked it without possession of the ball. Holliday gets home plate whether he touched it or not.