Based on the trailer for his new thriller "The American," George Clooney is back to his world weary ways. Just as he did in last year’s "Up in the Air," Clooney is a dedicated professional in the midst of a career crisis. True, the stakes are somewhat higher this time. Instead of corporate downsizing, Clooney is an assassin who travels to Sweden for one last assignment. The movie hits theaters on September 1.