Scalia, and Thomas.... (SCOTUS)
These are two Supreme Court Justices who claim to be staunch conservatives, yet they've dissented with what is clearly a states' rights issue. Now Roberts, I expected him to swing whichever way the administration does, but it's inexcusable for the other two.
The promotion of states' rights is one of the cornerstones of the conservative platform: it's an integral part of the ideology and has been (at least nominally) for most of recent American political history.
Personally, I've lost almost all of the respect I used to have for these two justices.