The closest the Left has to a guru is the Spirit Science guy (He's surprisingly progressive for someone who thinks jews are from space), and I still can't recommend that in good concious unless you need a short cartoon to explain a supernatural concept. The show's decent on Spirituality, it's tying it to Science that causes the problems...

It's almost like Religion and Science are entirely different concepts exploring different ideas, and shouldn't be merged together into one unified force anymore than my keyboard and my dresser!