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First lady Michelle Obama knows she has star power, and she has used it for four years to champion her causes of fighting childhood obesity and helping military families. But now that she has successfully made it through the last political campaign for her husband, President Barack Obama, the first lady is also having fun with her popularity - raising questions over whether she has gone too far in becoming a pop culture icon. Her surprise appearance at the Academy Awards - where she was beamed in from the White House dressed in a sparkling evening gown to announce the Best Picture award - provided ammunition for her critics. | 
