From the Wall Street Journal:
Will marches keeping going and growing? That will turn on organizers' ability to funnel frustration over deaths into a push for concrete demands, said David S. Meyer, author of "The Politics of Protest: Social Movements in America," and a professor at the University of California, Irvine.
 
Originally ran in Associated Press. Link unavailable. Instead see:
http://online.wsj.com/article/APdfce8c8c866241659e845e72c2469d7d.html?KEYWORDS=university+of+california+irvine