9/13: Colorado towns cut off by floods; man finds life-saving kidney for his wife

      |At least four people have been killed in the worst flooding to hit Colorado in generations. The National Guard was called in to rescue stranded residents, while the waters shut down a major highway and backed up sewers in Denver; and, Steve Hartman catches up with a man whose wife was suffering kidney failure. After his story first aired on the "CBS Evening News," thousands of people offered their kidneys - and one was a match.

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