Chris Hitchens has an honest evaluation of Jimmy Carter, who has the distinction of being both the worst President and worst Ex-President of my lifetime:

In the Carter years, the United States was an international laughingstock. This was not just because of the prevalence of his ghastly kin: the beer-sodden brother Billy, doing deals with Libyan President Muammar Qaddafi, and the grisly matriarch, Miz Lillian. It was not just because of the president's dire lectures on morality and salvation and his weird encounters with lethal rabbits and UFOs. It was not just because of the risible White House "Bible study" sessions run by Bert Lance and his other open-palmed Elmer Gantry pals from Georgia. It was because, whether in Afghanistan, Iran, or Iraq-still the source of so many of our woes-the Carter administration could not tell a friend from an enemy. His combination of naivete and cynicism-from open-mouthed shock at Leonid Brezhnev's occupation of Afghanistan to underhanded support for Saddam in his unsleeping campaign of megalomania-had terrible consequences that are with us still. It's hardly an exaggeration to say that every administration since has had to deal with the chaotic legacy of Carter's mind-boggling cowardice and incompetence.