A16 NEW YORK\/REGION B1-9 Newark 's Mayor Struggles With Unforseen Challenges Cory A. Booker 's dream of turning Newark into the paragon of American cities sounded good in campaign speeches , but after 100 days in office , the ambitious young mayor is starting to settle for a city that is a little less bruised , as he has come to find running New Jersey 's largest city more challenging than he ever expected .