By Joseph Enders, Church Militant - A leftist group is vowing to place the White House under siege... The 50-day protest, starting on Sept. 17, is being promoted by a revolutionary group called "Adbusters."... Though claiming to want nonviolent protest, the group's website provides questionable suggestions on what to bring to the protest: "Stuff your backpack with the tools of nonviolent revolution, and bring intelligence to match your enthusiasm."