FILE - In this Oct. 31, 2012 file photo, President Barack Obama is greeted by New Jersey Gov. Chris Christie upon his arrival at Atlantic City International Airport in Atlantic City. With humor and candor, Christie has been addressing a political vulnerability: his weight. (AP Photo/Pablo Martinez Monsivais, File)

Associated Press
FILE - In this Oct. 31, 2012 file photo, President Barack Obama is greeted by New Jersey Gov. Chris Christie upon his arrival at Atlantic City International Airport in Atlantic City. With humor and candor, Christie has been addressing a political vulnerability: his weight. (AP Photo/Pablo Martinez Monsivais, File)
FILE - In this Oct. 31, 2012 file photo, President Barack Obama is greeted by New Jersey Gov. Chris Christie upon his arrival at Atlantic City International Airport in Atlantic City. With humor and candor, Christie has been addressing a political vulnerability: his weight. (AP Photo/Pablo Martinez Monsivais, File)
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