'Home-based Terrorism:' Politics and Reality

A series of recent incidents led Homeland Security Secretary Janet Napolitano to warn that “home-based terrorism” is a threat the US “must confront.” American citizens -- including Muslims born in the US — are accused of planning some terrorist actions and actually being involved in others. How serious is the threat and how should it be confronted? Are American Muslims being radicalized? Is any substantial number likely to go overseas for training and then return to commit terrorist actions on American soil? Do Muslims have a special responsibility to combat it? What does it have to do with the wars in Iraq and Afghanistan? Does the Obama Administration exaggerate to gain support for military action?