The Obama administration’s auto task force chairman Steven Rattner has resigned and will be replaced by Ron Bloom, a senior task force member and former official with the United Steelworkers union.“With [General Motors’] restructuring complete, Steven Rattner, whose leadership and vision were invaluable to the Auto Task Force’s efforts, has decided to transition back to private life and his family in New York City,— Treasury Secretary Tim Geithner said in a statement.“Ron Bloom will assume leadership of the Task Force’s activities as the government transitions its role away from day-to-day restructuring to monitoring this vital industry and protecting the substantial investment the American taxpayers have made in GM, Chrysler, and GMAC.—Geithner offered praise for Rattner, saying he was “extremely grateful— for his efforts.