This interview would seem to suggest he is:
LERNER: I’ve met with a number of the political candidates and they said what I already knew, which is: “This is very good. We agree with it but we can’t say it publicly because the cynics who dominate public discourse would laugh us out of the political arena. We’re not going to say these ideas publicly until more of our constituents say them first to us.”
That’s how American politics works. It is democratic in that sense. You have to hear it from the grass roots before it will be said from the top. The New York Times and the Wall Street Journal described me as the “guru of the Clinton White House.” Supposedly I was a major influence on Hillary Clinton. Yet when I speak with Hillary she says that she agrees with everything I say, but she can’t put these ideas forward because she doesn’t hear them coming from people when she goes out to speak. That’s why I’ve organized the Network of Spiritual Progressives - to popularize a different way.