** FILE ** This undated file photo, provided Nov. 17, 2010 by Goodman Media International Inc., shows Donald Berwick, installed last year by President Barack Obama as a recess appointment, bypassing the Senate. Unable to repeal Obama's health care law, 42 Republican senators asked Obama in a letter released on Thursday, March 3, 2011, to withdraw his nomination of Berwick as Medicare administrator. (AP Photo/Goodman Media International, Inc., File

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** FILE ** This undated file photo, provided Nov. 17, 2010 by Goodman Media International Inc., shows Donald Berwick, installed last year by President Barack Obama as a recess appointment, bypassing the Senate. Unable to repeal Obama's health care law, 42 Republican senators asked Obama in a letter released on Thursday, March 3, 2011, to withdraw his nomination of Berwick as Medicare administrator. (AP Photo/Goodman Media International, Inc., File