Nixon and Jimmy Carter, for sure, and it is quite arguable that W. Son-Of-A-Bush, should also be counted. We all know about Nixon. Carter was just ineffective, poor judgement, and unluckiest guy to ever hold the office. W. for starting unnecessary war, based on BS, being a pawn of the far right neo-cons (including his VP) and of course, the economy crashed on his watch, taking out the branch I worked for, then wiping 35% plus of my retirement, while I was laying on a beach out of contact or knodwledge there had been a crash, but that is personal animus on my part, so all I really hold against him is the lives of friends and subordinates killed or maimed in his BS war.