1) Allowing Khomeini [hawk, spit] to depose the Shah, thereby ushering in the era of Islamic "republics";
2) His utterly disasterous handling of the Iran hostage crisis; and
3) Destroying the dignity of the Presidency by refusing to STFU as a former President.
When is this waste of protoplasm going to stop stealing our oxygen?
"Jimmy Carter will be remembered for d things:"
Uh, 3 things.