Greenberg is not a policy guy. The basic thrust of his polling is that in order to win, Dems should stress bread- and-butter class issues. He is not DLC. Penn is DLC and preaches the suburban/soccer mom/quality of life (i.e., crime, values) stuff. You can get the gist of his analysis from the DLC/PPI web site and their e-journal, "Blueprints."
mbs