When I was in Washington, I stopped by the Christmas Tree in front of the White House. Just so you know that there is no confusion as to what holiday is celebrated, there is a Nativity scene near the tree. Smaller Christmas trees from each state and U.S. territory encircled the larger tree. When we arrived at the tree, the presidential motorcade was leaving to go to the 'Christmas in Washington' concert at the National Building Museum - the program airs tonight on TNT.
I didn't go inside the White House to see the decorations, but you can view them here.