Yesterday, thousands of bikers descended upon Washington, D.C., for the annual Rolling Thunder Motorcycle Rally. The rally is an annual demonstration that was started in 1987 to bring attention to the plight of prisoners of war and to those service people missing in action. Among the riders? Sarah Palin. Decked out in a black jacket, big shades, and a Harley-Davidson helmet the Mama Grizzly transformed herself into a Motorcyle Mama for the day to join them in the cause. Palin was joined at the rally by her husband Todd (forever riding the metaphorical sidecar) and her two daughters, Bristol and...