Omar Wasow was quoted in The New Yorker:
I spoke by phone, on Friday afternoon, with Omar Wasow, a professor of politics at Princeton, who studies protest movements and their effects on politics and elections…
I would say that nonviolent protests can be very effective if they are able to get media attention, and that there is a very strong relationship between media coverage and public concern about whatever issues those protesters are raising. But there is a conditional effect of violence, and what that means, in practice, is that groups that are the object of state violence are able to get particularly sympathetic press—and a large amount of media coverage. But that is a very hard strategy to maintain, and what we often see is that, when protesters engage in violence, often in a very understandable response to state repression, that tends to work against their cause and interests, and mobilizes or becomes fodder for the opposition to grow its coalition.
The full article is available here.