The same people who are today giving Bush all the (dis)credit for the state of affairs in Iraq will, in a few years or in five, be spinning madly to deny him credit for the same. They'll say any President would have done it, or it would have happened by itself. (All the things they said about Reagan fostering the establishment of democracies in Central America, defeating the Soviet Union, etc.) In the end some will pretend they were with Bush all along. (As they now do with Reagan.)
But we'll know the truth.