Supporters of Chicago teachers, including Chris Southward hold a march in advance of a possible strike in Chicago

 
Supporters of Chicago teachers, including Chris Southward hold a march in advance of a possible strike in Chicago
Supporters of Chicago teachers, including Chris Southward, (R) hold a march in advance of a possible strike in Chicago September 9, 2012. Some 29,000 teachers and support staff have threatened to strike on Monday, setting up an awkward confrontation between Mayor Rahm Emanuel, President Barack Obama's former top White House aide, and organized labor in the president's home city. REUTERS/Jean Lachat