Tens of thousands of immigrants and their allies (and maybe more) are heading to Washington, D.C. to march for comprehensive immigration reform this Sunday. When I was in San Jose for my book tour, I happened to join a prayer vigil for reform–expecting perhaps 50-100 people. Instead, the group that organized the action, People Acting in Community Together, turned out nearly 700 folks. It was amazing, and got me thinking about how there might be tons of really effective organizing–and really m...