What is the role of rhetoric in influencing people's attitudes and beliefs? How can readers distinguish between prejudicial and non-prejudicial use of rhetorical devices?

Please see the following responses to this same set of questions:

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Posted by Ms. Sue on Tuesday, June 20, 2006 at 9:47am.
Check these sites to help you answer your question.

(Broken Link Removed)

http://en.wikipedia.org/wiki/Rhetoric

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Posted by Ms. Sue on Monday, July 10, 2006 at 6:25pm.
Check this site.

http://www.jessanderson.org/doc/rr_lingo.html

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http://www.jiskha.com/display.cgi?id=1157494639.1157499174
Posted by PsyDAG on Tuesday, September 5, 2006 at 7:32pm.
Although prejudice is often defined as a negative attitude, we all have prejudices (biases) toward almost everything we consider. Differences occur in terms of how extreme our bias is and how much it influences our actions - including our language. If we are aware of our biases, we can often minimize them.

I will give you some sources dealing with influencing others, but, since rhetorical devices are not in my area of expertise, I will leave it to you to relate the material to them.

http://www.members.cox.net/dagershaw/lol/InfluenceAntecedents.html
http://www.members.cox.net/dagershaw/lol/InfluenceMorePrinciples.html
http://www.members.cox.net/dagershaw/lol/InfluenceStillMore.html
http://www.members.cox.net/dagershaw/lol/MeanNewsMedia.html
http://www.members.cox.net/dagershaw/lol/Persuasion.html
http://www.members.cox.net/dagershaw/lol/QuestionFrame.html