NEW YORK, NY - JULY 14: A man argues with a police officer at West 34th Street as Trayvon Martin supporters march while blocking traffic after a rally for Martin that started in Union Square which grew to a crowd of thousands in Midtown in Manhattan on July 14, 2013 in New York City. George Zimmerman was acquitted of all charges in the shooting death of Martin July 13 and many protesters questioned the verdict.