Since the Obamas moved in, a cultural renaissance of sorts has been taking place in the hallowed halls of the White House. The latest breakthrough: Obama will attend a Seder celebration on Thursday night, the first time a sitting American president has done so. Passover starts on Wednesday, but the celebration is scheduled for the following day so that people may spend the holiday with their families. "I'm really happy to hear about it. It's been an extremely open White House to all faith communities, certainly including ours," one former official from the Clinton administration said. Two prominent advisers, Rahm Emmanuel and David Axelrod, both of whom are Jewish, are expected to attend.