McCain-Feingold
George Will has a good piece on how this bill really is a way to "protect" us poor slobs.
"The Affluent Society" was the canonical text of modern liberalism's disparagement of the competence of the average American. This liberalism -- the belief that people are manipulable dolts who need to be protected by their liberal betters from exposure to "too much" advertising -- is one rationale for McCain-Feingold. That law regulating campaigns embodies the political class's belief that it knows just the right amount of permissible political speech.