I've heard from some people who actually worked with Carter (Not first person, don't get me wrong) that he was really rather shitty to the people who worked for him, especially if they weren't his political appointees, and all his 'Hard working nice guy' persona was a total false front, aided and abetted by a sympathetic press. Though, I would say, despite his incredible incompetence and terrible decisions, for a politician he seems to have been fairly honest outside his image presentation.