Effectiveness of negative political advertising - http://www.scripps.ohiou.edu/wjmcr/vol02/2-1a.HTM Research paper indicating that poorer and younger voters are more receptive to negative ads than older and wealthier voters.
Political advertising articles and papers - http://www.uiowa.edu/~commstud/resources/pol_ads.html Extensive list of links at University of Iowa Communication Studies site.
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