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The claim was that UAW workers earn "significantly more" than non-UAW workers. Depending on your definition of "significant", that opinion may vary. But the claim of $73 per hour is way out of whack, and here's one article breaking it down:
http://www.tnr.com/politics/story.html?id=1026e955-541c-4aa6-bcf2-56dfc3323682