CAMBRIDGE – A leadership transition is scheduled in two major autocracies in 2012. Neither is likely to be a surprise. Xi Jinping is set to replace Hu Jintao as President in China, and, in Russia, Vladimir Putin has announced that he will reclaim the presidency from Dmitri Medvedev. Among the world’s democracies, political outcomes this year are less predictable. Nicolas Sarkozy faces a difficult presidential re-election campaign in France, as does Barack Obama in the United States.