(NEWSER) - Among the families around the world gathering tomorrow to celebrate the beginning of Passover with a dinner, or seder, will be a high-profile group: the Obamas. The White House seder tradition started on the campaign trail in 2008, when then-senator Barack Obama surprised three staffers by showing up for their makeshift celebration in a Pennsylvania hotel basement. Last year's seder was a bit more impressive, with close to two dozen friends, relatives, and staffers gathering at the White House. More»