[Jung Ji-Hoon]

William Henry Harrison

Another ill-fated Whig President (the only four Whig Presidents either died in office or were Whig Vice Presidents taking their place),
William Henry Harrison makes the list of of the worst because he accomplished so little: he died his 30th day in office, of pneumonia. No justices were appointed, no states admitted, no laws passed. That year saw three presidents -- Van Buren before him, and Tyler after him. His death (since he was the first president to die in office) made the nation settle what should happen in cases like these.

He was also the first sitting president to be photgraphed; while earlier presidents were photographed, they were photographed AFTER him, while no longer in office.