New York City Mayor Michael Bloomberg takes part in a discussion of economics and the politics of immigration with former White House Chief of Staff William Daley during a meeting of The Chicago Economic Club Tuesday, Aug. 14, 2012, in Chicago. (AP Photo/M. Spencer Green)

Associated Press
New York City Mayor Michael Bloomberg takes part in a discussion of economics and the politics of immigration with former White House Chief of Staff William Daley during a meeting of The Chicago Economic Club Tuesday, Aug. 14, 2012, in Chicago. (AP Photo/M. Spencer Green)
New York City Mayor Michael Bloomberg takes part in a discussion of economics and the politics of immigration with former White House Chief of Staff William Daley during a meeting of The Chicago Economic Club Tuesday, Aug. 14, 2012, in Chicago. (AP Photo/M. Spencer Green)
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