Springfield becomes the site of the first presidential primary. The townspeople soon get sick of all of the presidential candidates sucking up to them, and decide to support their own write-in candidate: Ralph Wiggum.
The new prankster in Bart's fourth grade class actually turns out to be a mole brought in by Principal Skinner to infiltrate Bart's inner circle. Homer falls in love with his loaner car after Marge wrecks their old one.
One of Bart's pranks results in Martin's death, but Lisa doesn't want him to confess because she would be considered an accomplice. Marge hires a television crew to find out if Homer is cheating on his diet.
Marge has Lisa take up ballet, mainly to have Lisa live out her own childhood dreams. Lisa then succumbs to peer pressure from her ballet mates and takes up smoking. Meanwhile, Homer and Bart try to start their own beef jerky business.