FILE - In this April 7, 2016 file photo, President Barack Obama right, jokes with Chicago Mayor Rahm Emanuel left, while arriving at O'Hare International Airport in Chicago. People are expected to line up in frigid temperatures Saturday, Jan. 7, 2016 for tickets to President Barack Obama's farewell speech in his hometown of Chicago. Obama plans to speak to supporters there on Tuesday night. (AP Photo/Paul Beaty File)
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