My vote is for that sanctimonious racist, Woodrow Wilson. We tend to forget how much of a mess he made in the close of WW1. First trying to get all of the ‘tribes’ into their own countries and then allowed the British and especially the French to totally eviscerate Germany to the point of preparing the ground for Hitler and WW2. He did a pretty good job on the US too until his stroke and absent presidency.
I consider Woodrow Wilson to be one of the two Presidents who injected the greatest quantity of slow-acting poisons into the political bloodstream of the United States of America. Unlike his competition for the "worst," Wilson was something of a proto-Obama insofar as absolutely nothing he did by design or accident was actually beneficial to the US.
JFK doesn't even come close to being the worst; moreover, he is now only runner-up in the category of "Most Media Sycophants."
Mr. niteowl77