President Barack Obama and First Lady Michelle Obama greet trick or treaters at the North Portico of the White House

US President Barack Obama and First Lady Michelle Obama greet trick or treaters at the North Portico of the White House as they celebrate Halloween in Washington, DC, on October 31, 2009. The First couple welcomed more than 2,000 children from Washington, Maryland and Virginia schools and their families to celebrate Halloween. AFP PHOTO/Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)