sentences:  Its atmosphere is so polluted that it reduced a comet to a tiny rock the size of a chihuahua's head.In politics, the mayor of Springfield is Joe Quimby, while the town's representative in Congress is Herschel "Krusty the Clown" Krustofsky (R) of the 24th congressional district.In "Sideshow Bob Roberts", Sideshow Bob (R) ran for Mayor of Springfield and defeated Mayor Quimby, but was later discovered to have committed pure electoral fraud.