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I know some of the people who have been included in these surveys, and your assumptions aren't correct.
Historians are, by and large, a leftward leaning bunch. There are notable exceptions, especially among those in the military history and international relations fields, but they don't tend to be the kind of individuals who dominate the list of those surveyed for this sort of thing.
A number of organizations conduct such surveys. The latest was conducted by CSPAN. Siena Research Institute of Siena College will conduct one eventually, and that is generally considered the standard. Depending on the nature of the survey, the historians queried either have their own model they use in their answer, or the survey organizers present them with a model to use. Different models include elements such as "delivered campaign promises" or "effectively responded to crisis" while others focus on foreign policy or domestic policy or an average of both. The former can result in widely varying results, to wit a President who promises to cut taxes on the wealthy and start a war would rank highly if he did those things even if those policies positively sucked by most other measurements. The latter often results in people like Nixon's ranking being all over the place. Simply due to Watergate, many rank him among the worst. Others, however, look at his domestic and foreign policy agendas and find mixed results with some stunning successes along with abysmal failures, and in the end, he ends up with a higher ranking than he might have if judged solely on the fact he was forced to resign in disgrace.
To my knowledge, this CSPAN poll is the only one conducted that includes Bush since Obama took office, and historians haven't actually had a great deal of time to measure the lingering effects of his administration. Had such surveys existed at the time, Pierce, for example, might not have come across too poorly with some who saw him doing a lot of the things he said he would do. How bad a President he was became more apparent as time passed, and it is now clear that his administration handed Buchanan the problems the latter failed utterly to try to address, the end result of all that being the Civil War.
In any case, our modern sense of exceptionalism is on clear display in reactions to surveys like these. Most agree that Dubya was a horrible President, but, so far, we cannot link him directly to our nation dissolving in a civil war (Pierce) nor can we yet charge him with shifting government resources to the very elements within the nation that would build up armies and seek to rend it in two (Buchanan).
I find it a little strange that we seem compelled to split hairs over this to the point of damning almost the entire history profession. What the survey shows, beyond all the arguments about placement as dead worst or almost the worst, is that historians rank him among the worst ever, along with people who at the very least unknowingly brought us to civil war or at worst actively aided that result. That's a fairly damning judgment.
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