About a dozen students arrested by police clearing a sit-in at a Denver college campus emerged from detainment to cheers from fellow pro-Palestinian protesters, several waving yellow court summons like tiny victory flags and imploring fellow demonstrators not to let their energy fade. Just how much staying power the student demonstrations over the war in Gaza that have sprung up in Denver and at dozens of universities across the United States will have is a key question for protesters, school administrators and police, with graduation ceremonies being held, summer break coming and high-profile encampments dismantled.