A thought experiment for Bush
Suppose in 1999 that Clinton, with Gore's approval, had started a war that Bush believed was the wrong war, in the wrong place, at the wrong time. Would Bush have refused to criticize the Clinton/Gore decision in the 2000 campaign?
Of course Bush refuses to answer hypothetical questions, so he could avoid this question. Too bad that it means we have no idea how he will act under hypothetical situations. We can guess though.