SANTA SHAKE Dr. Jill Biden, wife of Vice President Joe Biden, watches as Santa arrives for a visit with children during a holiday event she hosted at her home at the National Observatory in Washington, D.C., Dec. 1, 2010. Dr. Biden invited 25 children whose parents are local National Guard members and 25 from local schools. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 547137-I-YGE04-106.jpg Photo Gallery