Disclaimer. Don't rely on these old notes in lieu of reading the literature, but they can jog your memory. As a grad student long ago, my peers and I collaborated to write and exchange summaries of political science research. I posted them to a wiki-style website. "Wikisum" is now dead but archived here. I cannot vouch for these notes' accuracy, nor can I say who wrote them.
Iyengar and Kinder. 1987. News that matters.
The media can change our (expressed) opinions without changing our (underlying) attitudes at all, through priming, framing, and agenda setting. Thus, political campaigns don't change our minds; they try to make us think about considerations that will lead us to support one candidate over another. The authors back up their arguments with experimental evidence.
See Zaller (1992) for a development of this logic.
Research by the same authors
Research on similar subjects