Political correctness is not merely an expression of opinion: it is the denial of anyone else to hold a differing opinion--or even personally-held moral and religious convictions. It is exactly what Thomas Jefferson detested and personally opposed: it is "tyranny over the mind of man."
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http://chuckbaldwinlive.com/Articles/tabid/109/ID/3320/Political-Correctness-Tyranny-Of-The-Mind.aspx