President Barack Obama's performance at the United Nations last week was widely hailed -- and condemned -- as a clear departure from that of his predecessor, George W. Bush. His most telling statement spoke volumes about the limits of U.S. power in an interdependent world: "Those who used to chastise America for acting alone in the world cannot now stand by and wait for America to solve the world's problems alone." Subtext? Atlas has put down the heavy globe and has neither the intention nor the wherewithal to pick it up again.