Members of the Chicago Police stand guard outside the re-election headquarters of U.S. President Barack Obama while the protest group Occupy Chicago has a rally in Chicago

 
Members of the Chicago Police stand guard outside the re-election headquarters of U.S. President Barack Obama while the protest group Occupy Chicago has a rally in Chicago
Members of the Chicago Police stand guard outside the re-election headquarters of U.S. President Barack Obama while the protest group Occupy Chicago has a rally in Chicago May 21, 2012. Chicago is hosting the world leaders meeting at the NATO Summit which runs from May 20-21. REUTERS/Frank Polich (UNITED STATES - Tags: POLITICS)