@digital_carver wait, what? Taft is pretty well-known for not really wanting to be president, but taking the job until he could be appointed Chief Justice. Plus he had an important role in the story of Teddy Roosevelt, who's even better known.
And then there's the reason all the schoolkids remember him: being so fat as to get stuck in the White House bathtub.
@khird I must point out that to me the phrase "least famous" implies famous and excludes forgettable, despite my tendency as a wannabe mathematician to extend the meaning of abstract quantities to encompass as wide a range of values as I can justify.
@digital_carver