The power of petro-czars has slumped as oil prices have fallen
                                
                                
                                    (Newser) -
                                    There is one silver lining to the global recession: The economic and political fortunes of America’s oil-rich antagonists have been tarnished, Rana Foroohar writes in Newsweek. Russia’s Vladimir Putin, Iran’s Mahmoud Ahmadinejad, and Venezuela’s Hugo Chávez have all been humbled by the falling price of...