I think Bush's signing-statement strategy was more constitutionally burdensome than Clinton's because, for myriad reasons some of which I've alluded to earlier but won't repeat, the Bush approach made an attempt or at least a show at usurpation, a strategy that is destined for failure in the courts but which, unchecked before that, can skew the political process and particularly both the perceived and actual prerogatives of the coordinate branches, and thus the system of checks and balances. Further, in a broad notion of constitutionality greater than a mere positivist conception that the law is what the courts say it is, it is proper and wise to idealize both the principles but also the functioning of the federal structure such that a "workable consensus" can be achieved and (most of the time) "wiser heads [can] prevail."