The young boy greeted the Obamas as he went through the trick-or-treating line outside the White House on Monday. He was dressed in a large yellow duck suit with bandages to indicate he was "lame."
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Social media users found the costume clever, even going so far as to say it won Halloween.
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Scores of kids showed up in costume to the Obamas' final Halloween celebration, including a little boy dressed as Obama himself. White House photographer Pete Souza was on-hand to capture a cute moment between the president and Walker, the son of press secretary Josh Earnest, who was dressed as Superman.