My suggestion for worst-ever US President is old peanut-brain himself, Jimmy Carter. I see he has been over here in the UK bad-mouthing Guantanamo Bay, bad-mouthing the US decision to liberate 25 million people in Iraq, blaming America for creating the Jihad(!) and doing his best to bolster the enemies of democracyt wherever he can find them.
Hey Jimmy - let's suppose we do what you want and let all those hundreds of captured Jihadists out of Guantanamo - any thoughts on what they might fancy doing? Betcha it'll not be attending international Baptist meetings. Carter is a creep and a national disgrace - no wonder he won the Nobel Peace Prize! He really is the lowest of the low.