Unexpected turnover in the White House: Steve Rattner is stepping down as "car czar" a day before President Obama makes his first trip to Michigan to chart a plan for the Big Three's survival. Rattner is leaving on his own accord, an administration official told Politico. "He determined that this was the right decision for him and his family at this time," the official said. Ron Bloom, who was an administrator for the United Steelworkers and is a member of the auto task force, will replace Rattner, a former investment banker and journalist. "I hope that he takes another opportunity to bring his unique skills to government service in the future," Treasury Secretary Timothy Geithner said of Rattner.