Moving away from the findings regarding individual judges in my two prior posts, I thought I would talk about some of my aggregate findings. In particular, one question that often arises in discussions of the federal judiciary is: which President(s) appointed the most ideological judges. Conventional wisdom has been that President Reagan appointed particularly conservative judges. Some also have argued that President George W. Bush appointed ideologues to the federal bench. Based upon my study, the judges appointed by President Reagan do appear to be especially ideological. However, the data did not support a similar finding as to those appointed by President George W. Bush. The figure below indicates the net Ideology Scores for the six most recent Presidents before President Obama for all of the judges in the dataset.Outside of the judges appointed by President Reagan, there is remarkable symmetry among those appointed by the Presidents after President Nixon. There is one important caveat to the above findings, however. The older appointments represent a non-random sample of judges appointed by Presidents Ford, Carter, H.W. Bush, and Reagan. For those Presidents, there have been a large number of retirements. It might be that the judges who remain on the bench today do not adequately represent the entire class of appointees by those Presidents. Regardless, it is interesting to see that other than President Reagan’s appointments, the current Courts of Appeals appear to have been stacked to roughly the same ideological degree by the various Presidents.