FILE - In this Aug 5, 2012 file photo Social Security Administration 

FILE - In this Aug 5, 2012 file photo Social Security Administration Commissioner Michael J. Astrue speaks at a news conference on the Social Security and Medicare Trustees report  at the Treasury Department in Washington.  Astrue says he will step down in February after completing his six-year term. (AP Photo/Charles Dharapak)
Associated Press
FILE - In this Aug 5, 2012 file photo Social Security Administration Commissioner Michael J. Astrue speaks at a news conference on the Social Security and Medicare Trustees report at the Treasury Department in Washington. Astrue says he will step down in February after completing his six-year term. (AP Photo/Charles Dharapak)
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