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What's so bad about that? Buchanan was certainly bad, but that doesn't necessarily make him the worst President in US history.
These were my thoughts. Buchanan is underrated not by virtue of any accomplishment of his own but merely because so many of his colleagues set the bar so low.
Well, the thing is that you have so many of the bottom of the barrel Presidents as "underrated" that is seems like you wouldn't have a worst President. So who is the worst one in your eyes?
Probably states rights-crushing tyrant Lincoln or commie FDR. Libertarian logic, you see.