President Obama's plan to send 17,000 troops to Afghanistan is meeting opposition on his left and skepticism from some allies. What can the president reasonably hope to achieve in Afghanistan? What alternative policy options could he consider? We talk about all the elements of the Obama strategy in Afghanistan and whether nation-building is still possible. How has the military mission there changed in the last seven years? Whose hearts and minds can we win in Afghanistan? Does history show that foreign military power can never control Afghanistan?