[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/images/11/30/obamainner.jpg caption="Tuesday, Obama will announce his strategy for Afghanistan"] By: George Lerner President Barack Obama has waited too long to address the instability in Afghanistan, putting at risk the efforts to stabilize the troubled country, two leading writers said Monday. Historian Simon Schama and journalist George Packer told CNN's Christiane Amanpour that U.S. policy … Continue reading Leading writers urge Obama to speak forcefully: