For what it's worth, some people consider James Buchanan the worst President. (I take it with a few grains of salt.)
* James Buchanan: Why is he considered America’s worst president? -- "April 23 marks the birthday of James Buchanan, the man regarded by many historians as one of the worst—if not the worst—presidents of all time. So what did Buchanan do to earn the disrespect of so many people?"