I can only go on what I know from personal experience, so I would say Carter followed by Clinton.
They were both bad for the country in different ways.
Carter was bad because he set the USA up for were we are now with terrorism. He stabbed the Shah in the back, and was too stupid to manage the country. There were some things he couldn't control, but he totally balled up the things that he could.
Clinton was bad for the everlasting damage his administration did to the office of the presidency, and the demolition of our national security.
I like Bush, that is evident, but the thing I do like best is that you know President Bush is there to work, not find playthings to manipulate with cigars. Clinton thought the presidency was his private playground. And like uncultured hillbillies thrust into money, they were grabbing at it with everything they had. Pathetic.
Carter. Worst president in United States history. By a mile-long gas line.
Clinton's sexcapades were at least amusing and he signed Free Trade and Welfare Reform.