The Opinion of the Court was very respectful of Federalism. How hypocritical. The Liberals on the Court hate Federalism and only use it when they need it to get the result they want. When they didn't want it on the medicinal marijuana case, they junked it in a flash.
Thomas is consistent, though, since he applied the plain language of the Fifth Amendment to show that the drift away from original intent has just gone too far. (His embrace of the incorporation doctrine is not Federalist, of course, but that issue is pretty much settled. Nobody would argue that states can conduct searches in clear violation of Amendment IV, nor impose cruel and unusual punishments).