Yes, John, there are conservatives who think the line-item veto–at least the version of it that the Court considered–is unconstitutional. But that does nothing to vindicate Giuliani’s argument, which is that it is beyond argument that it’s unconstitutional because the Supreme Court says that it is. That’s a classic statement of judicial supremacy that conservatives have, for the most part, resisted, and rightly resisted. (Note also that there is no conservative argument for the judicial activism Giuliani urged w/r/t guns, welfare, etc.)