Actually, as I read article iii, section ii of the Constitution, this is no such usurpation.
"In all other cases before mentioned, the supreme court shall have appellate juridiction, both as to law an fact, with such exceptions, and under such regulations, as the congress shall make."
Based on this, I would suggest that no such usurpation exists. What happened is that Jeb and his attorney looked for a legal and Constitutional method to assist in what they - and Terri's parents - wanted to have happen. It is within the purview of the congress to make laws regarding jurisdiction.
Finding legal and constitutional ways to get the outcome you desire is not usurpation.
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