While fishing near the power plant, Bart catches a three-eyed fish. A reporter is nearby and takes the story to the papers. Mr. Burns is blamed for the mutation, and is told to bring the plant up to scratch or have it shut down.
Homer tells Burns that if he were governor he could change the laws and keep the power plant open. So Mr. Burns runs for governor, with a team of spin doctors and publicists trying to improve his image. They tell him that he is losing touch with the common man, so he goes for dinner with the Simpsons.
However, Marge (who does not like Burns running for governor) cooks the three-eyed fish for dinner for Burns. He takes one bite and spits it out. His campaign is ruined.