[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2011/images/08/30/costello_vert.jpg width=200 height=230 align="right"] From CNN's Carol Costello: It's a difficult question. If you're a protestor, the answer is simple, forever. If you're a police officer, it's not that easy. Especially in light of what happened in Oakland. As Oakland police tried to clear out "Occupy Oakland" protestors, Scott Olsen, an Iraq war veteran, … Continue reading Talk Back: Should cities prevent Occupy protestors–not from protesting–but from camping out?