Having lived through Carter, I believe that Obama is worse. Carter was a fool and severely misguided. They say he was very intelligent, but they say that for all Democrats, but his perspectives were all wrong. As bad a President as Carter was, nobody ever said that Carter wanted to do harm to the U.S. and did his best (sadly enough).
Many people believe that Obama has an agenda to harm the U.S. It’s not an irrational belief, since his autobiographies basically acknowledge that.
Carter was inept. The school of thought and Obama’s orientation, as a socialist/Marxist from the school of Saul Orlinsky and Acorn, indicates that he does want to harm the Country.
Incidentally, Hillary Clinton is from the same Orlinsky Chicago school of thought. Her lust for power supersedes her philosophical views, so she hides it better.