For my 2301s: We discussed how public opinion is often influenced by the frames of reference placed around whatever the public might be thinking about. Real power stems from being able to influence the context people use to form opinions about someone or something. This often determines the conclusions people make about those people or things. Its one of the goals of a successful campaign.
I was thinking about this when I saw the following effort by Governor Perry's campaign to frame Bill White a "liberal trial lawyer" rather than an ex-mayor.