After Maggie watches a violent Itchy and Scratchy cartoon, she attacks Homer with a mallet. Realizing that Maggie was influenced by TV, Marge campaigns to eradicate violence in cartoons.
Marge stages protests and appears on TV. Eventually the producers give in and ask Marge's help in making the cartoon less violent. The show becomes very lame and ratings plummet.
However, when Michelangelo's nude David statue is brought to Springfield, the other parents ask Marge to lead their campaign against it, but Marge likes the statue. She realizes that it is hypocritical to be against one form of free speech and support another.