'Joy to All,' Christmas at the White House -- PICTURES

The official White House Christmas tree, an 18-foot-6-inch Frasier fur from Jefferson, N.C., trimmed with ornaments decorated by children of military families, sits in the Blue Room of the White House. ((AP Photo/Susan Walsh))

The official White House Christmas tree, an 18-foot-6-inch Frasier fur from Jefferson, N.C., is trimmed with ornaments decorated by children of military families in the Blue Room of the White House. ((AP Photo/Susan Walsh))

The Truman China is set on a table in the China Room of the White House. This set was first selected by first lady Bess Truman in 1951 and is the first state china service to feature the presidential coat-of-arms as redesigned by President Harry Truman in 1945. (AP Photo/Susan Walsh)

A portrait of former first lady Pat Nixon hangs near a tree in the Vermeil Room of the White House. (AP Photo/Susan Walsh)

First lady Michelle Obama decorates a lollipop during a holiday decoration preview at the White House in Washington. Obama joined children as they decorated holiday treats during a preview of the White House holiday decorations.  ((AP Photo/Susan Walsh))

First lady Michelle Obama joined school children as they decorated holiday treats at the White House. (AP Photo/Susan Walsh)

White House Pastry Chef Bill Yosses explains his design for the nearly 300-pound gingerbread house of the White House, on display in the State Dining Room of the White House. A tradition going back to the 1960s, the house features Bo, the Obama family dog, a vegetable garden, and views inside the White House. (AP Photo/Susan Walsh)

The White House vegetable garden is replicated as part of the nearly 300-pound gingerbread house of the White House, on display in the State Dining Room of the White House in Washington, Wednesday, Nov. 28, 2012. The theme for the White House Christmas 2012 is Joy to All. The White House gingerbread house has been a tradition since the 1960s.   (AP Photo/Susan Walsh)

Bo, the Obama family pet, is replicated on the nearly 300-pound gingerbread house of the White House on display in the State Dining Room of the White House.  ((AP Photo/Susan Walsh))

First lady Michelle Obama, accompanied by first dog, Bo, walks past reporters during a visit to the State Dining Room of the White House. (AP Photo/Susan Walsh)

Olivia Marlow, 6, looks at a tree honoring presidential first ladies that is on display in the Grand Foyer of the White House in White House. (AP Photo/Susan Walsh)

A tree honoring first ladies is on display in the Grand Foyer of the White House in White House. ((AP Photo/Susan Walsh))

A decoration is on display in the White House Library, which includes "replicas of holiday cards and notes from past administrations," according to the White House description. (AP Photo/Susan Walsh)

A Christmas tree decorated in a rainbow of colors sits next to a statue of President Lincoln in the East Garden Room of the White House. ((AP Photo/Susan Walsh))

A stained glass "wreath: hangs in the East wing of the White House in Washington, Wednesday, Nov. 28, 2012, during a preview of the decorations. The theme for the White House Christmas 2012 is Joy to All. (AP Photo/Susan Walsh)

Volunteer Paulette Marini describes the decorations on the tree in the East Landing of White House in Washington, Wednesday, Nov. 28, 2012, during a preview of the holiday deocrations. The decorations pay tribute to the Armed Forces and their families. The theme for the White House Christmas 2012 is Joy to All. (AP Photo/Susan Walsh)

President Barack Obama smiles in front of Christmas decorations as he listens as Mexico's President-elect Enrique Pena Nieto, not pictured, speaks prior to their meeting in the Oval Office of the White House in Washington, Tuesday, Nov. 27, 2012.  (AP Photo/Jacquelyn Martin)