Trick or Treat: Obamas Expect 2,000 Children at White House for Halloween [See Pic in URL of Michelle Obama] President Barack Obama and his wife, Michelle, invited more than 2,000 children to the White House on Saturday night for a Halloween party. 31 Oct 2009 Barack and Michelle Obama greet trick or treaters at the North Portico of the White House as they celebrate Halloween Photo: AFP/Getty The children, from Washington DC, Maryland and Virginia, were to do their trick-or-treating on the most famous front porch in America, the North Portico. Later, in the East Room, the first couple were...