Government shutdown: Who is non-essential?

Dark clouds hang over the U.S. Capitol in Washington on Saturday, Sept. 28, 2013. A midnight Monday deadline is approaching for Congress to break an impasse over funding the government. In a rare weekend session, lawmakers from both parties urged one another to give ground in their fight over preventing a federal shutdown. (AP Photo/J. Scott Applewhite)

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    Government shutdown: Who is non-essential?

About a quarter of "non-essential" government workers could have forced and potentially unpaid time off starting Tuesday.