Protesters swarm on final day of NATO summit

Associated Press
Demonstrators head towards Michigan Ave. in Chicago during a protest march as a part of this weekend's NATO summit Sunday, May 20, 2012 in Chicago.  (AP Photo/Seth Perlman)

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Demonstrators launched another round of protests May 21 in the final hours of the NATO summit, marching through an unusually quiet downtown Chicago to the headquarters of Boeing and President Barack Obama's campaign.

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