Xenocide
Not to mention the episode where Jimmy himself (described by Lisa as "the nice guy who finished last") does a rap and breakdance routine.

Daddy Warcrimes
Also, the episode where Homer and his dueling glove get him on the wrong side of a southern gentleman's revolver, and they plead Carter for help when they pass a Habitat for Humanity site.

(And proceed to enrage him and earn a duel challenge while speeding away.)

K. Brass
There's a $10,000 bill in it for you.

Oh yeah? Which president's on it?

Um... all of them.
They're having a party.
Jimmy Carter's passed out on the couch.

Senator_Unger
You can't forget The Critic clip:

"My name's Jimmy Carter and as the nicest and therefore worst President of the twentieth century..."

mon666ster
Ahh, those were simpler times, weren't they?

glasseye
Ah, the good old days...

Desidiosus
Since then, malaise has become passé and everyone's moved on to ennui.