I was reading this morning that 98% of 109 history professors surveyed by the History News Network adjudged the Bush presidency to be a failure. This seems a trifle early for such a pronouncement, but they are a liberal lot and probably can't resist. A survey in 2003 found the Democrat to Republican ratio of history professors to be about 9.5:1.0. As a scientist, I have never really been convinced historians differed greatly from modern-day property assessors. The work product of both depends largely on what they start out to look for.
Finally, historical evaluations such as this remind me of meteorological predictions of our climate decades into the future when we have little to no idea what the weather will be like next week. Liberal historians do it in reverse.