The Drum Major Institute for Public Policy contends that any debate over immigration policy must be connected to the larger conversation about America's squeezed middle class and those striving to attain a middle-class standard of living. Accordingly, DMI offers a lens through which to evaluate immigration policy that operates from the basic principle that immigration policy is sound only if it also helps to strengthen and expand America's middle class. With that premise as our starting point, we wrote "Principles for an Immigration Policy to Strengthen and Expand the American Middle Class: 2007 Edition." First published in December 2005, "Principles" is now updated to reflect recent legislative proposals and a discussion of issues that have emerged as important. It is intended to serve as a guide for those who wish to advance a progressive immigration agenda that reflects the best interests of America's current and aspiring middle class.